Despite the fact that I bought a fully-paid-up-front version of Platinum (with Lifetime Updates, no less!), I'd be inclined to pay a reasonable subscription fee towards ongoing development/support.
The thing is: I really
like Sonar. When the Big News dropped and everyone started jumping ship, I held off switching to something different and (hopefully) have been vindicated in my decission. Truth be told, I ended up throwing quite a bit of money in Cakewalk/Gibson's direction for ProChannel modules and the like. No reason I won't be doing the same in BandLab's case (you can never have too many tools). I
want to keep using Sonar as my go-to production solution and am willing to pay for the possibility.
(We can't really ignore the elephant in the room that is Windows 10. Without continued support, a Win update is bound to break your software sooner or later.)
On a different, but somewhat related, note: I'd love to see the product ecosystem expand to cater to a diverse userbase. Ideally, the future would see a cross-platform (which, these days, is pretty much a must), multi-tier toolset that would allow a kid in his bedroom to start with something simple and affordable and then have the opportunity to gradually upgrade right up to a fully professional, studio-grade solution and see their skills - and tools in hand - transfer every step of the way. I was under the impression that this was the general idea under Gibson, before everything went pear-shaped.
My thoughts on the matter are somewhat informed by how Microsoft has recently been handling Visual Studio development. For all the complaints one may have with MS (got a couple, myself), they really do make my developer day-job so much easier and they've done a lot of very sensible things with both .NET and the VS ecosystem.