The Miz would have made a great heel corporate champion in place of Randy Orton IMO.
I'm not a fan of the guy but I could see it working. I said a couple of months ago that my issue with this angle was Orton being the chosen one of the McMahons to lead the company as the face of it for the next several years. I know Orton is young and still has plenty of years left, but regardless, we've seen him win countless world titles and headline countless PPVs already. A fresher main eventer would have interested me more, especially if you wanna make comparisons with The Rock becoming the heel corporate champion back in late '98. The Rock was someone who had never been a headline guy prior to him joining up with Vince and company, and the same would just about be true for The Miz. He's only main evented a few times and been WWE Champion only once, unlike Orton. (And truth be told, I enjoy Orton more as a face when he's The Viper anyway.)
The Miz is easy to picture in a suit (I really thought they should have dwelled on that aspect alot more with Orton, and like had him go back to wearing a suit like his Legend Killer days), has that look of a guy that you just want to punch in the mouth (the fact that he's backed by the corporate head honchos would only make you despise him more) and with doing so much promotional work for the WWE, it makes since for them to want him as the champion that represents their company and brand name. Plus, he did good/great numbers as the heel WWE Champion in 2011 if I recall.
As it is, he could still turn heel and go after Bryan for the WWE Title after HIAC (assuming Bryan wins it back). but I don't foresee that happening.