AVGN and Nostalgia Critic as guest stars (or Vs. Siskel and Ebert)

Seriously: how the hell have they not been guests, or even had suggestions that they be guests acknowledged by the crew, yet?

Who should they play (preferably opposite one another)?

Even though I'm otherwise always against using internet celebrities as characters (in fact, I actively HATE Peter Vs. Lloyd), I also think that AVGN and NC Vs. Siskel and Ebert could work as a legitimate exception to that rule, and could totally see Peter and Lloyd as the latter pair of critics.