The thing that most concerned me about this Legends and Lore is this - we are one year into playtesting, and yet this seems like possibly such a major reworking of the way classes are balanced against each other and the way character advancement works. At this rate DNDNext looks like it won't be finished for at least 2 years, or else it will get rushed at the end. Any way, with respect to the actual proposal, I suppose it could work but I'm very concerned about their ability to balance such strong feats against each other and against ability score modifiers.
Only if their internal playtest looks anything like the public one, and I don't think it does.