Yes the skill level of USPSA shooters has gone up as far as shooting USPSA matches goes. What I don't see improvement in is the shooters who can excel at multiple pistol disciplines. I guess it's partially because in the past there wasn't nearly the amount of USPSA matches, especially majors to shoot so people wanting to shoot more would also practice and shoot Bianchi, Steel Challenge, Bowling Pins and matches like the Masters. You pretty much had to shoot the other disciplines if you wanted to shoot a lot of big matches. Also the USPSA COFs of the past had more accuracy oriented standards making it an easier transition to Bianchi for example. Most people look at the Steel Challenge as a speed shoot but it's really and accuracy challenge that looks like a speed test.
Not to take anything away from the current top shooters, they are way ahead of even 5 years ago. So the answer is a diffident yes.