It´s just an unlucky period with a lot of 'stars' injured. If it ever gets good again is not sure.
Sharapova, Ivanovic and Venus will probably never be the same again.
Clijsters is playing few tournaments and retiring soon.
Henin is gone.
(Like this, you already lose rivarlies/match-ups like Clijsters-Henin, Clijsters-Sharapova, Ivanovic-Henin, V.Williams-Henin)
Serena is the biggest factor. She should be healthy soon. And even if she is, as long as she doesnt have anyone comparably good against her, women´s tennis might still be a bit boring. Watching Serena thrash Jankovic, Safina, Zvonareva in grand slam finals is not as exciting as a Henin-Williams final.
A Wozniacki-Zvonareva final will never attract many viewers.
If only Stosur, Kuznetsova, Schiavone got more consistent, women´s tennis might get popular. But only Wozniacki can keep being solid it seems. There is no competition for her basically. Serena, Venus and Kim injured/resting and the rest is just too up&down. You just have too many Na Li´s, Pennetta´s etc. etc. atm.
What can be done? Kim and Serena should be healthy
, Stosur should work on her movement, return and backhand and she will beat Kim and Serena regularly. Wozniacki shouldnt change a thing.
These four players can make the WTA tour exciting and attract as many people as it used to have. With occasional Schiavone-Kuznetsova GS marathon WTA might be comparable to ATP.
Nothing can be done, it´s just a bad period. It might change soon hopefully.