To me that is the point I see in Monte's "mastery" construction. It's not about the logistical problem of adapting to a new skill set, it's about the emotional problem of the impact of change on play value.
Whether that's a problem that 3.5e is apt to suffer, I don't feel qualified to say. My point is simply that it isn't about whether people will adapt, but about how they will feel about having to, and what game designers can do to make that feeling better or worse. As long as we agree on what the potential problem at hand is, I have no problem with different speculations and conclusions about whether 3.5e suffers that problem.