I'm not sure if I can be completely positive about The Shield winning the gold.
The Shield has been pushed so hard that we won't be able to buy anyone as a threat to them.
The U.S. Title has been the new European/TV title, the third tier belt for the low level guys to fight over ever since TLC 2011 when Ryder won it. While Ambrose himself will be booked strongly as Champion, I worry that it's not really going to elevate the belt. Since the Shield works primarily against big stars, the belt will end up as a non-factor because everyone Ambrose will be working with will be "too good" for it. I feel like Ambrose will just hold onto the belt forever and do nothing with it. Then when WWE decides they want to randomly give a midcard face a push, Ambrose will lose the belt in a "fluke" and forget about it.
As for the tag belts, Reigns and Rollins have no competition unless you pair two more random directionless main eventers together, which does nothing for the tag division.
The Shield have been booked very strongly. But I feel that because they've been booked so strong, the belts are now stuck in limbo (the tag belts have in limbo for a long time, but now the U.S. belt is too). The only people who are threats to them are main eventers, and guys like Sheamus and Orton aren't gonna go after the U.S. Title any time soon.
It's possible that the Shield could save the midcard, but then if you do try to push any midcarders or tag teams as a threat the Shield, people might see it as a step down for the Shield and complain they're being "buried" by having to work with "lesser" talents.