I'll say this: I will feel safe to upgrade to the next version when it comes out, and my speculation is, unless there's some pretty major new features being added late in the process, it's surely got to be close.
As far as subscription models, I personally don't see that being deployed before the next version. And to be honest, I think a subscription model would be great, if it's more like the Netflix model, where you can pause it. If the DAW were able to "check" its activation to enable the Audio Engine, that could be a great way to allow new users to get visually and ergonomically oriented with Sonar without allowing them to actually
use the software. Then, activation could be based on a monthly subscription. So, for bands that want to record themselves, but do so only a semi-annual basis, they can
rent the activation for two months out of the year, for say, $10-20/mo. the longer your subscription runs, the better your discount (or more subscriptions). I'm basing the latter on the GotoMeeting pricing model.
If the subscriber buys a year's activation, it would run, say $99/yr, $149/2yrs, $199/3yrs. Month-to-month would be, say $19.99/mo. ($479.76 for 24 mos.) You can see that compared to a one-time $399 for Producer, these look attractive. Sure, the long-term users would receive a discount, but you could attract many more occasional users to offset that discount, awarding the long-term users the higher appreciation.
btw, $12.99/mo. for X
n Studio and $9.99/mo. for basic X
n.
The software is downloaded and installed, but requires Internet access to validate subscription.