Klepsacovic: I expect it will fail terrible
It's a big change. But it's not a big enough change. WoW needs a lot to change for talents to ever be truly choices. These changes are beyond just tweaking talents, or even redoing the system entirely. Raiding must change. Classes must change. Groups and soloing would need to change. Core mechanics like aggro and the near-universal immunity to CC and impairments that bosses enjoy would need to change.
I was exaggerating to say it will fail. I'm sure the new talent system will be fun enough and I doubt it will kill WoW. But the new system won't "fix" talents. I believe that is impossible.