I've got to agree with Tom on this one. Quite a few good cast members have gone on to bigger and better things.
I think where the problem comes in, SNL has always been out there on the edge and do not pander to the masses. Not all the skits are going to appeal to everyone all the time, but when they are on and in line with your understanding of what they are satirizing, they are still the best out there with any kind of exposure.