Why can't people see past their own fanhood? It's either "push the fucking shit out of him" or "fire the spot monkey" or "Vince hates him". No, Vince hates guys who don't make him money.
Here's what you do. You put him over Truth at SummerSlam. The beauty of Truth's character is it'll stay over if he loses, and actually, probably get even more over. You can't have him lose too much coz then nobody buys him as a threat, but if he loses in a big match to a returning fringe upper card babyface, that's fine.
After that you see the reaction. You push the guy based on the reaction. The reaction tells you the direction to go. It's not that hard. More over than before? Push more than before. Less over than before? Push less than before. About the same? Push the same.
So based on that, here's my plan.
If he's less over than before. He has a rematch with Truth and loses. Then you have him feud with a less over heel like Jack Swagger. However, in between you have him kill Michael Cole since Cole is such a heat magnate.
If it's the same as before, you give him an opportunity to get more over. I'd guess to play to his strength you give him some crazy shit to do and use the Jeff Hardy theory of "if you jump off enough tall shit and get 14 year old girls to like you, you'll eventually get very over". Let's just hope Morrison doesn't develop a drug habbit. So you have Truth beat the shit out of Morrison so people don't forget how dangerous he is. You book a "little Jimmy on a pole" match at Night of Champions. If Truth wins, he gets to beat the fuck out of a kid with a barbed wire bat, if Morrison wins, Truth gets tied down and the kid beats the fuck out of him with one. Just kidding. You actually book Truth vs Morrison in a street fight.
If he's more over than before (after summerslam, not my last paragraph) then you put him in a feud with either Del Rio or Miz. I say this because I don't know the plans WWE has for the rest of the roster. Del Rio could be champ by then. Miz could be in a red hot angle with someone else. Who knows. If I were to rank the heels, it'd be Punk, Del Rio/Miz, Truth, so one of those two is a logical step for me.