Cynthetiq, that's not a bad point (about so many MMOs being canned recently), but that's just because the the genre is way, way overcrowded right now, and it's only going to get worse. So many companies were making so much money with these games, that everyone else decided that they wanted a peice of the mmo pie too
Hardly sounds like a failing business model to me. Any other aspect of gaming or media wouldn't be able to support that much product either.
Let me give you an analogy: since Lord of the Rings was wildly successful, you can be sure we're going to see a lot more fantasy 'swords 'n sorcery' type flicks in the next couple years. We already have. Since there's going to be such a deluge of them, some of the ones that don't break new ground or aren't as quality will bomb. That's ONLY b/c of the newfound popularity of the genre though. Some of them failing is a testament to their overwhelming newfound financial viability; everyone is getting involved. On the surface it might look like the fantasy genre is floundering, in reality it's much more successful than it ever has been.
The same is true of MMOs