Eh, y'all want them 2005 John Cena vibes, never thought I'd see the day. I don't have an issue with Cody winning against Brock, but not the Hogan/Cena miraculous comeback- that's the kinda stuff that starts getting babyfaces booed.
Beating Brock in a competitive match would be him picking up the pieces after Mania, but we gotta give him some form of adversity before he wins the big one. Before Mania, he was batting .1000, his only adversity had been a real-life injury. Besides that, he had beaten everyone he faced on TV and events... winning the title would have been him continuing to win all the time until he lost it. I don't think the dude is in any danger of losing ground right now- in fact, him losing the match at Mania has only increased people wanting to see him win it. He could afford that loss. Obviously, they can't take forever to have him finally win the title, but that Cena route ain't the way to go with him. He's even more babyface-ish as a character than Cena as is, that plus a Superman push would sink him.