"Are the pros getting too powerful?"
One way to bring them down to earth would be to simply make them ride Eddy Merckx-like schedules. Race twice a week, all year. CLassics, Monuments. Two Tours. 6-days. Cyclocross. Won't ever happen. Any rider who chooses such a path would be committing to a lost year. CPA, the teams and and UCI would never stand for it. Merckx rode 1800 races. Over a 12 year stretch, the number of classics, grand tours he rode was staggering and were only maybe a third of his year's diet. With that many races, peaks are near impossible to manage. Altitude training simply does not happen. That three weeks in the Azores - nope. Muscle re-charging 8 weeks off in late fall - nah.
What riders do now vs a few years ago is apples and oranges. I suspect a real part of this was drugs. The EPO days lent themselves to sequestering at altitude or Atlantic islands to drug and train far from the drug controls. But the reality that targeted training instead of weekly racing works has stayed. And is not going to go away.