In the last 2 weeks, I've updated my Studio One 2 Artist, installed Reaper (with a "sonar x1" theme) and bought Samplitude Music Studio 2017 and Mixcraft 8 Home Studio (at Steam, promotional prices).
First impression is the same as the thread's author. Nothing compares with Sonar's workflow.
Reaper - mainly because the skin/theme - was the best to use. I've made a song, but to be honest, I'm still not comfortable using it. The other 3, were even more difficult.
My decision is to keep using Sonar, until it dies or can't handle some important technology. But I'm not going to "freeze" my machine, hardware or software. I don't want to be "out of the world", in terms of musical stuff...
Sadly, I don't believe in any form of Sonar "resurrection". The team is dismounted. The people that understand each part of the code will soon begin to forget it. I work with computer programming. Old code is the worst thing a programmer want to deal with!
So, I'll keep using Sonar, but will try other DAWs as much as I can, even if my stomach aches, to find something that resembles the great DAW I've been using for so many years and now is gone...