iOS7 is already doing that. It's switching from skeuomorphic buttons to just typography.
This doesn't address your larger point, given that the switch to lines doesn't mean that they're bringing advanced functionality yet, but it's a sign that they are willing to trade away easy of learning.
This doesn't address your larger point, given that the switch to lines doesn't mean that they're bringing advanced functionality yet, but it's a sign that they are willing to trade away easy of learning.