The lack of diversity on SNL is striking. Especially considering their impersonator for Barack Obama isn't of African heritage at all. Their sole African-American cast member, Kenan Thompson, often gets dress-up duty as a black woman (as none exist as cast members). But goodness Fred Armisen is of Venezuelan & Japanese heritage, as there would be no Asian or Latino/Hispanic representation, either.
I'm pretty sure most folks reading in this thread don't care about such things, but most shows with ensemble casts have a lot more diversity than this. SNL will be relying on guest stars for a while, provided they actually try humor outside of the writers' universes.