There's no way Adobe will change to autosave as a default... or change Save As.
Professionals don't make stupid mistakes where they forget to save files... and if you're in an area where the power is often interupted (Nigeria?)... then you'll have a backup power supply. And "Save As" is something that I, and others, use so often in Photoshop, InDesign, Acrobat... etc. that it would royally f__k up our workflow. We would scream!
Whereas at the moment Save As and Autosave with Mountain Lion mainly affects TextEdit, Preview, and maybe QT. Imagine... with users as p____d off at this as they are now with these minor apps... what Adobe users would do if Adobe tried this. Not going to happen.
Microsoft on-the-other-hand may well change since they too, like Apple, are increasingly concerned with newbies forgetting to save their work... and wanting to iOSify the system so all will be the same.