I shared this idea in the Rumble OT thread but I wanted to mention it here too.
If they plan on doing a Shield reunion at some point, Mania would be a great time to do it. Have Rollins goad HHH into having a match at WrestleMania, and then have Rollins talk HHH into making it a no disqualification match since that's when HHH can really be "the destroyer". Then at some point during the match, Roman and Ambrose show up - have HHH realize that the entire no DQ thing was a big set up by Rollins - and then all three of them beat the living tar out of Hunter since they all are anti-authority guys. You get your Shield reunion, Roman actually gets solid pops, and Rollins looks like a brainy architect.