I grabbed SO3 months back and picked up a Faderport 8 too, and there's much to like there, but SPlat and a Faderport 8 may be where it's at.

olemonShould I Stay Or Should I Go

With DAWs it is possible to "stay AND go" at the same time.
 
Since Sonar has some future now, there is a big chance you can stay longer. But X1 and even early versions are still working on Win10, so even without any changes the probability you can continue next 10 years is hight.
 
 
It may be unclear which future Sonar has, but the same can be written about any DAW. Check how fast other DAWs have dropped 32bit versions (and by doing so taking away 32bit plug-ins compatibility). One day it is there, next day it is gone. And not only about DAWs: one day your audio interface works with current OS version, next day it is a door stopper in case you upgrade the OS.
 
And nothing is wrong with "walking around". You can find interesting other programs. For some you can conclude they are just "interesting", other can be useful for something particular. It can also happened you consider to "change the house". Some people are changing flats/towns/countries without asking "should I stay or should I go".

This is one of those questions that only you can answer.
The best you will receive here are opinions. Which im sure that's why your asking anyway

BRuys
Before the acquisition announcement, I went out and purchased Studio One.  Now that I know that Sonar will live on, it will continue to be my go-to DAW - Why? - Because I have years invested in getting to know it better than any other software and I also have a huge library of Sonar projects.
 
The way I see it, I now have a secondary DAW which I might get some use out of and have some fun with, but no amount of money can buy the years of familiarity and knowledge I have in Sonar.  I can get things done in Sonar so much faster, because I know it so very well.  No brainer for me.

Zackly...  (btw, I think Studio One looks like dog-do next to SONAR X3e.)  I'm staying, with S1 as a fallback.

Hi. I got S1 Pro as a backup (tested REAPER as well) when the news came in late November. I also have MixBus4.
I've worked in it/them, and have no problems, except for a few things I missed from SONAR (Region fx, and Offset mode to name a couple).
I think of them as another tool(s) in the toolkit that I'm able to use.
Still used SONAR as my main DAW, and will continue to do so.
All the best.
 

Although I have Samplitude Pro as a backup, I've never left Sonar. I'm extremely comfortable with Sonar and will stay with it until one of us can't.
 
Like Chuck said, only you'd know what's best for you.....for me it's....well, you know.

Play it by ear ... he he... get it ...he...er um ... sorry, don't get out much.

I never left. Didn't even get out of my chair. 

I'm finding a use for multiple DAWS - and kinda of overjoyed to have two - SPLAT and SONE3.   I go to splat primarily for my own personal song writing, and recording say, a single artist. I'm faster, less confused - and it has more tools to construct music. I also use a MOTU 1248 interface and the quality is pretty spiffy.   
 
I go to sone 3 for live or full group recording AND for mastering.  The fit with the CS18, RM32, UC surface and Remote are the bees knees. A slight bit less quality than MOTU - but only slight. I can control monitors, start/stop. mix from many different locations.  I really like the combination for performances - parts we record that can't be played live normally, are now at every performance. The exact effects too..  Just plain cool.  
 
It could very well be that I sub optimize my knowledge retention and speed - however,  for me its all about getting to the music part.  I'm a writer, performer first - engineer (loosely used term) second. 
 
Glad to have a future with whatever it will be called, formally known to me as splat.  :o)   

I think this decision is largely personality driven. Some people need a single direction and they need to stay the course. If they change courses after carefully thinking their options through it'll be a cold day in hell before they go back. 
Some people are better at utilizing two things together. It was a bit of a circle jerkel there for a while. In reality nothing had seriously changed in terms of the software itself. We missed a few Sonar updates. Some people carried on as if nothing ever happened. Some people resigned to wait it out and see.Some people acted like they lost their lover for life. It's interesting to see the different reactions to this.
 
Those with that singularity kind of approach simply dumped Sonar, bought something else and didn't take the time to post why.They were too busy using a replacement. 
 
I have had several daws for years. I didn't really need to buy anything else although a few of the offerings were tempting and I did buy them. I was one of those "just in case" people. If this happens then I'll have that. No matter what you do in life it's always a good idea to have a plan B. 
 
If having lots of options drives you crazy, then you will probably fare better picking just one and staying with it. If you like options and can find constructive ways to use multiple programs why not? Neither type is bad.