Well... In my Opinion for the survival of the company the "OSX New line" will be Critical. no doubt about that... so definitely The Actual Platinum will Die some day... 1 year? 2 years ? Who Knows?... the "Lifetime updates" its a good deal until the end of the current version... even if it last for 1 more year!
this way you own a more updated DAW Platform and Cakewalk get some more money Up front to pay the expensive Development of the upcoming Win and OSX Versions... We have to remember the fact that Cakewalk is a Business... its a profit entity and behave like its suppose to be...for their own benefit and survival... different strategies will be necessary in order to accomplish this in a very competitive and aggressive DAW market...
Other thing i'm thinking about future possibilities: Been many years a "Win Only DAW" The "Sonar Name" have some kind of
"Consumer-level DAW" reputation among Professionals Using Mac's ... in a marketing perspective there will be necessary to come out with a Fresh image that Position Cakewalk products on the new Market segment they are targeting.... we are talking about, new Name , New image, new product line, maybe.. in few a words: As soon Cakewalk release and perfection Mac-Win products... closer the end of Platinum series or maybe of "SONAR Name" it self... Who Knows?
I work For a Marketing Firm In Atlanta GA, and i have seen how companies re-design, re -named and re-invent them self's in order to get a fresh start in their markets, i support whatever is good for the grow of the company and the development of more powerful tools for Audio-music Production, i consider Sonar a very robust and Professional tool regardless it is just a Windows Only... and im using it since Cakewalk 9.