Yeah, other than Epic and UE, I guess I don't see a whole lot of licensing going on, for how many games are released. I've always liked Source quite a bit, but the number of titles using it outside of Valve's own products is pretty small. I guess Valve knew they were gonna improve Source early on, so you'd think companies would love that ability to buy an original license for their game, and for a smaller fee and much less time than an all-new upgrade, over the next couple of years they could get the Source improvements as Valve does (HDR mainly, also Source 2007 improvements like multicore support is suppose to be coming to older Valve titles).
CryEngine 2.0 is great of course, but I don't think most devs want to do what Crytek did with Crysis and release only a powerhouse/technological marvel. If all games were like that, well for anyone who doesn't upgrade their video card every year or more, they'd be screwed. I'd like to see some games based on it. Well for that matter, I'd like to see some Source, some UE3, some id engine, etc.
Then again, of the shooters left like COD, Medal of Honor, GRAW, and so on, I guess they have old versions of their own engines to use generally. And sometimes the feel might not be right for a different dev's game. Source-based multiplayer games always seem to have a similar feel, even if they are totally different or are mods.
I guess I'm just kind of surprised that with the ridiculous development costs and time required for a modern PC game, that more licenses aren't sold for the more established engines.