As always when using omni's your room is going to play a larger role to the sound then if you were using cardioid's, so if your room isn't so great, the results could be poor. Other then that, go try it! I've been wanting to try that same thing with some naiants.
Well, since I do it, it probably doesn't make sense.
However, it can sound good. I happen to have enough Studio Traps that I can wrap the drum kit and get a really good tight sound and dial in how much room sound I want.
Sometimes I like the sound of just those two mikes, when I want a kinda mushy kick drum sound. Depends on the sound I'm after.