While it's probably true that ProTools is becoming less ubiquitous in general, and that other software packages will be used for greater numbers of recordings over time, the computer industry has shown that lots of technical standards (and I use the term loosely) hang around for reasons that aren't that great, long past their heyday.
The history in general has been that software changes operations practice and not the other way around. As long as this general trend remains in place, real portability of session files will probably continue to be a pipe dream fighting its way around PT and competing vendors file structures for the foreseeable future.
It will probably never get to the point that the chore of freezing/zero-aligning the audio in yr sessions in order to prepare them for a transfer to a new platform will be replaced with some universal session standard that grants session portability.
The industry as a whole is still immature and vendor slap-fights still reign supreme.
-r
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