Consider: When Verizon doesn't allow mp3 ringtones ... well, you just don't get phones with mp3 ringtones on their network [1].
When Apple doesn't allow mp3 ringtones, Verizon is compelled to open the door to Android phones that happily allow mp3 ringtones so that they can compete.
The only reason Verizon and AT&T have rolled back any of their customary phone-crippling practices is because other phones must compete with the iPhone.
Consumers have 'won' to an astounding degree since the iPhone released. I don't know anyone who's purchased a phone in the last three years, that didn't wind up with a device head and shoulders more capable and well designed than what they had before.
Frankly, I can't think of anything remotely close to a 'regression' that actual consumers would have been forced to swallow post-iPhone.
[1] Yes, I completely discount the existence of unlocked unsubsidized phones on US networks prior to the iPhone. 1. they were horrible, 2. there was no break on service fee for having an unsubsidized phone, if not an outright charge for bringing your own unlocked phone, making the effective price wildly prohibitive.