I'm not so sure ProTools is going to survive long term. How much new blood are they getting? The big studios tend to stick with older versions "forever" and let's face it, the big studios are closing up faster than you can say iLok.
Avid's stock price has been on a dive and while it's leveled out it's in the crapper.
Avid seems to be ignoring the smaller studios who aren't going to be buying Avid hardware so those users are using not only ProTools but other DAW software in conjunction.
As for the others, who knows?
Cubase will probably be developed forever because of Yamaha and the fact that they have a huge install base, especially in Europe.
Reaper will survive due to the business model.
My money for the sleeper DAW is on Studio One. It's still developing but is attracting a lot of new users who are looking for something different that does what it promises well rather than promising the kitchen sink and not delivering.
Personally I can, and do use, any of these programs so it's really a moot point for me.
I suspect it's the same for most people.