This is going to be one of the biggest "no"s I'll ever say. *ahem*
No!
"It might be a fair contest since Extra Credit provides more issues that can be talked and debated over in the comments, but" stop there! No "but"s. This sentence is not just one little factor, it's absolutely the whole reason why EC has more comments. 100% the reason.
Another thing is that I don't at all think ZP is running "out of steam". Most of the time, it's just individual fans going through ruts of being tired of it. It's happened to me tons of times with various shows.
"...And thus my clarvoniancy was revealed"
I've heard it like, five times, but he always puts a little twist on it each time. It's a great running gag right now, because it's a running theme in the games right now!
"messes with the filing system."
I've heard that one... uh I don't remember ever hearing that one.
And finally: So far I have not been very impressed with Extra Credits. Maybe it's because I spend more time thinking about video games myself than you do, but he has yet to tell me aaaaanything I don't already know. Worse yet is the length. I can't watch an 8-minute games commentary video when there's only 2-minutes of actual games commentary, and the rest is filler.
"Sometimes, a video game makes you question your own being! Because sometimes games make you think about who you are, because games are an exciting new medium that can do a bunch of great things that other mediums can't!"
I mean come on, he has said different variations of "games are an exciting new medium" fives times more than Yatzhee has said "...And thus my clarvoniancy was revealed".