If anything more committed players will be able to recognize situations where they'll want a certain talent or skill over another. You are getting hung up on the big choices - this or that talents.
There will be variety in the survivability, healing taken, etc talents.
There will always be the big right choices, but that's never changed, what changes is the little choices. You can see this in the way warrior tanks builds change and evolve as they gain gear, rogue builds change to emphasis survivability or damage, etc... that's always been the strength of these talent trees and what's missing from the current system.
If anything, casual players will most likely go cookie cutter, a few will adventure but most are going to copy the build that they were told is best.