It's not speed, it's the lack of athleticism IMHO.
There are no great athletes in women's tennis anymore.
For someone like Lindsay Davenport to compete, she had to have one of the greatest forehand-backhand-serve-return combinations in tennis history.
Women's tennis doesn't seem to attract the best athletes anymore. I think that must be part of the reason. That and, as mentioned above, the fact that it suffices most of the time to just ballbash. If you can win like that, you don't need to be a good athlete and thus, you can make your way to the top of a rather lucrative sport while being athletically (very) mediocre or poor.
Again, with Monica, she needed some of the greatest groundstrokes EVER to compensate for her lack of athleticism.
This guy is an athlete. There's more to "athleticism" than being able to move fast. Players like Robson, Kvitova and the other postergirls of "slow moving hard hitters" that you can think of are athletic. There's a reason why they can generate power with their shots that other players can't and a lack of athleticism isn't the reason.
Many players are just plain lazy.
They're satisfied with their lifestyle and their income.
Yeah, I'm not buying that as a theory. Since this applies to players outside the top 100 (who can struggle to afford to continue playing and thus don't have much cause to rest on their low net income) as well as the top players.
Nowadays, any hard worker could jump up from #70 to #35 in three months as all the girls are pretty much on the same level but only a few are willing to go the extra mile.
Or alternatively the fact that there's less than 500 points between #35 and #70 (a gap that could be spanned with a few good runs at MM tourneys, of which there are 6 between the start of Febuary and the start of May, ignoring points that could be gained in Premier qualies).
at the same time we have ATP and Murray who can run first 20-30 meters as fast as Usain Bolt and "on his best day he can do 27 pull-ups, and push 500lb on the leg-press"
Is tennis' anti-doping programme still as much of a joke as cycling's was before they cracked down on it?