There would be a lot less injuries if all players were as professional as Federer.
On both tours.
Did you notice that Federer is never injured despite playing tons of matches?
Could be coincidence, but I doubt it.
He is probably the fittest player on the ATP Tour. He's among the fastest, and no one moves as fluently as he does.
I'm sure he would NEVER suffer an injury like Pierce did just because he is a much better mover.
Then, lots of injuries probably happen because of bad/stressful shot techniques. Others because of bad scheduling, over-playing, over-working in practice.
Also, many many problems come from over-playing at very young age, especially for girls. See players like Graf, Seles, Capriati, the Williamses and many others who had more and more injury trouble the older they got
Federer has perfected all these categories to the max.
I'm not saying that players like Sharapova should change to a Federer-like one-handed backhand. But there are many other things that can be done just by putting more professionalism into all the elements that are part of being a tennis pro.