Another thing that came to my mind is that if The Shield wins the tag titles they can hold them for a couple of months. Have a feud with 2 or 3 teams over 8 months. They win the tag titles 3 times and when losing it WWE can disband them and challenge each other for the midcard belt that Ambrose won. This triple threat feud can go from Royal Rumble and end at Wrestlemania so an almost 4 months feud. IF WWE books all these things right it can be something good. Because after they have disbanded and have had a time from each other as a group WWE can go with the DX thing, by reunite The Shield again.
DX got together and disbanded 4 or 5 times. And in my opinion they should do the same with The Shield. Imagine in a WWE Championship match at Summerslam 2014 you hear that theme song and the lights goes out and then out of nowhere we have The Shield attacking the Champion with the ref down. I bet many of ,we the fans, are not going to expect this and it would be a big shocker to us. again in my opinion.
But if The Shield vs Evolution happens i think like you guys, Evolution wins.