One suggestion I've heard is to keep the courts the same as they are, but to use the lighter tennis balls in play at WTA events. I think it was Brad Gilbert suggesting that I'm not sure.
Still speeding up and shortening the points on some of the hard courts which give players' ligaments and joints a battering, can only benefit their health as well as promote more diversity.
Maybe at some tournaments, people want diversity more than all courts being faster I believe.
How about speeding up some courts and moving the service line closer to the net to stop big serves dominating?