My understanding was that the lifetime license was supposed to be for a small group of people but the word got out. Lifetime licenses are never a good idea for a product like Sonar. Even then, the amount of people who ended up buying it had to be large but in the long term, it would have been damaging. FL Studio I feel gets away with it easier because of the market they cater to (EDM) which is not your typical Sonar user.
I'd happily give up my lifetime license and go back to my annual fee if it meant Cakewalk remained in business... but only if they rid themselves of those parasites at Gibson.