I was happy Miz won at WM. I thought maybe Miz could help re-build the midcard while Barrett went to the main event and feuded with Cena. Unfortunately that didn't happen. (I did know that Miz was leaving to film his movie though)
What I think should happen now is The Miz should return on the May 7th ep of RAW and attack Barrett and announce he's envoking his rematch clause. Miz can win at ER and then defend at Payback successfully. After this, Wade can win the MitB and Miz can go back to re-building the mid-card. This way, they both have a storyline for the next few months.
I see this happening too. Miz wins the title back at Extreme Rules, and Payback ends the feud.