I'm really not sure how much I will use Sonar in the future.
I started thinking that I would stick with Sonar until I was forced to change...
I then decided to cover my options because of the commercial offers. The current Cubase offer plus 2 or 3 years of upgrades being cheaper than a full price purchase in 2 or 3 years time. Plan was to keep using Sonar, take some time to learn Cubase and make the switch at some future date.
Playing with Cubase I found it easier than I expected, I like some of what's on offer and now understand what I'm going to lose by not using Sonar. I have bought the full version of Lounge Lizard, before the upgrade offer emerged, and True Pianos. I'm still making my mind up about Nomad as the $99 for the larger package looks a lot better than the upgrade offer for what Cakewalk included. I'm definitely going to miss some of the Cakewalk effects, along with the support for DNA Grooves and Style Enhancer, a third party MFX. But looking to the future my plan is to focus on Cubase and use Sonar when/if it makes sense with my immediate focus being on making sure I have a suitable replacement for the content that I use that is locked to Sonar.