How many space combat games can we have?

An article on Massively talking about a forthcoming game called Black Prophecy made me think about space combat MMOs. I'm not sure how much room there is for them. I'm not saying the desire for a space combat MMO is zero - Eve Online would put paid to that - but I wonder if Eve hasn't cornered the market on this sort of gamer. To be fair, Eve has issues, by all accounts, so I suppose simply doing Eve better might reap a significant reward. We'll see how this new game does (I saw there was a beta signup - maybe I'll give it a run once I get my new setup in place (assuming the movers don't break my rig))