The music biz likes unofficial technical standards in as many instances as possible, and rightfully so. Just like how NS-10s were an unofficial standard so that people could go from one studio to another and still be familiar with the monitors, people don't want to have to learn 3 different DAW packages just to work in different studios across the street from one another.
However, there's one thing the music biz likes even more than unofficial technical standards, and that's money. Protools can still justify its existence because it is a de facto unofficial standard and people don't want to learn a major new piece of software just for kicks, and there's no clear DAW software that's heir apparent.
Also, at the real high end, such as in hollywood movie scoring, I believe there are still tasks that a totally computer based DAW still can't offer. So if the major industry guys have to use protools on their major projects then they aren't going to learn another piece of software. And as long as the major industry people have to use protools then there'll be a trickle down effects that makes all other people keep wanting to use protools too.
So as much as I am not a fan of digi or their products, protools isn't going anywhere any time soon.