But as of now.
I'll say it certainly doesn't feel like a possibility of 0% to happen.
And not all jobs. Mains would definitely be more dynamic though.
Eg. Tanks would probably switch to 1 or 2 DPS classes while in OT state, then back to tank to Provoke and MT.
If they don't simplify at all... I'm drooling at the idea of playing like this. I've always loved dynamic play like this. (eg. Haseo from .hack//G.U.)