We've seen all the big changes that will ever happen in tennis.
The racquets are a big as they'll ever be, and all these new technologies in racquets don't really make them better, its just a marketing ploy.
I think we've even hit the upper limit of string technology until they come up with better coatings and materials to remove friction and provide better snap, thus creating even more topspin forcing courts to slow even more and balls to become more heavy, and then everyone will be like Nadal with two blown knees from the long, horribly boring I might add, rallies.
With that said, we'll probably figure out how to maximize human potential even more through better nutrition, advanced healing techniques, so we might see play sped up a bit to compensate and players might be able to have a career into their 40s and still win.
Yonex RDiS 100 Midplus, Tourna Poly Big Hitter Silver 17 @ 54lbs.