Again, people who are talking about skill trees are missing the point.

Is the current model sustainable? No. We don't need to wait until we have 8 hotbars covering half our screen and a 51 unique input opener to realize this.

I think they did a good job with HW's new skills for the most part. They filled gaps in some classes and added skill to playing some other classes. But, I can't see this system lasting another 10 levels and 5 skills.

I don't like skill trees either and only think they're viable when you have actual choices - a caster class choosing between a DPS or healer spec, a melee class choosing between a tank or DPS spec. It's for this reason that effective skill trees won't work in FFXIV -- we have jobs with defined roles. But, there has to be some type of solution to the skill problem eventually. Like I said earlier, SE just punted the problem down the road with HW rather than address it.