You guys are jumping all over the thread starter, but I think he has a point. I mean WWE is doing a lot of things differently lately, but classicly, I'd say he's getting buried.
Lets look at some precedent within the past year though. Jack Swagger got a title run and was subsequently buried(although I don't think he's a main eventer anyway). Wade Barrett got that massive push last year, then BAM, John Cena beat him at TLC and he's been getting buried since. Someone mentioned CM Punk not being buried just because he finally got this one big storyline last week, but lets not forget what it was about, it was about him being buried. Kane was face for a long time before they decided to push him last year, til he lost the title and now things are same with him as they ever were.
Back to The Miz(who I also don't quite think is a Main-Eventer), when has the "winner" at Wrestlemania ever gone downhill this fast. I mean, I think this storyline with Alex Riley is perfect for him, not for someone who just Main-Evented WM. How many matches has Alex Riley even been in? Miz is getting squashed by a rookie man. Even if this is to elevate Alex Riley, he's been on top of this feud since it started. Normally the heel gets to do some vicious shit to the face before the face eventually starts gaining the upper hand.
Whether he's Main Event material or not, he did have momentum behind him as Wade Barrett did and now its getting squashed. After years of WWE doing things very slowly, they are now fast tracking everything, and it started with Sheamus. I'm not saying that I don't want to see new faces at the top, its just that WWE went from one extreme to the other. It seems like with the amount of talent thats been leaving the WWE lately, they're throwing stuff at the wall and seeing what sticks. Think about it, Sheamus' biggest claim to fame before the title was ending Jamie Noble's career. R-Truth went from a Santino type level to feuding for the title. Barrett was a rookie.
I feel sometimes like Vince does this just to prove the IWC wrong, like hey you wanted us to push new guys now we're doing it and you're not responding.