Interesting concept, and a very brave and bold move to throw out what they have been expanding upon for the last 6 years.
This is not lazy as some seem to think. Lazy was adding more and more onto the existing trees bloating them more and more every time.
Certainly the lack of a point per level will be missed with it being seen as something to aim for, but levelling should be about more than just getting the next point.
Locking into a tree has potential, particularly when you get that bonus as a result of it, just it will lock you out from other useful talents as someone brought up the subject of Omen of Clarity.
Taking longer to reach your signature, and often pretty damn useful end-talent is not likely to be a popular move, and I hope there is enough in the tree to provide sufficient utility for your role to make up for that.
As to how well it will work out, we have to see, but most of you should stop flaming an idea which you do not like, before we have even seen it, and providing no arguement whatsoever other than your opinion.