Yeah, sorry, I just don't see shooters getting much out of a kickstarter. There are more than enough of these kinds of games making the rounds -- there's absolutely no reason for people to throw their money at a promise when they can experience an actual product within a few clicks on Steam.
A tactical shooter is a very different form of FPS. Rainbow Six and Ghost Recon have all changed into something else, probably Brothers in Arms too. I still play GRAW(2006-7) and I want to see new games. (I found this gem, SW: Republic Commando, a bit late but it quenched my thirst for a while.)
On the other hand, you are probably right on your other point. I don't think they can get the money needed anyways. I think Tribes Ascend is a better example for proving the need for "a bit more complex and different" games. Adventure games aren't the only ones that got
MIA.