The thing is you are always going to have folks who will stay current and those who lag behind and now there is a third potential stream of purchases that may not have existed with the month to month folks. IDK... if Cake simply stays on top of things, which they really have been for the past year, I'd say they'll be fine even if the subscription model can be gamed a little. Remember even though those late adopters would technically get more they MAY miss out on one off freebies or plugs that get removed AND they have to wait longer. Those who pay the premium to stay full up to date do not run those risks. Seems to me like there are tradeoffs and benefits to both approaches.
I still think they should introduce a pay model where you can buy a block of program time with a countdown so if you only want to buy 10 hours of Sonar use you can. That is something I could make use of. I'm not in front of my DAW consistently enough to make a monthly subscription worth it (even though $14.99 is really cheap I may not even look at my DAW in that month).
Edit: Cripes... can't speel werth carp twoday.