I'm a Shibs uber but I do not want them to come back.
Why? Because of all the backlash and dislike against them and the politics they'd be up against internationally? Or because you think it would take away from up-and-coming U.S. teams? Actually, I think the Shibs are very much missed on the current scene (of course Zhulin and Rusfed don't miss them

).
One reason the ShibSibs are missed is because they were the steady, technically proficient U.S. team who were very hard to keep down due to their technical brilliance and calm under pressure. They were also wise in the way they went about gathering outside-the-box ideas from a variety of sources to craft creative programs with wonderful impact in the last few seasons of their competitive career. They achieved a lot against the odds, and in some quarters they are still disliked and put down because they were so good at being focused on positively weathering the challenges and the backstabbing, and prevailing against some considerable odds.
With the political maneuvering going on to keep the top Russian teams solidly in podium contention, Hub/Don have been targeted as being vulnerable, despite their huge talent. Meanwhile, Chock/Bates have staged an engaging comeback under the guidance of Dubreuil/ Lauzon, but as we have seen played out on the GP, Zhulin appears to have a rock-solid hold on keeping SinKats in silver medal holding pattern, whilst Rusfed otherwise has babyface & beauty (S/B) also solidly in the mix despite the drawbacks/weaknesses of these Russian teams. Having rock-solid Shibs out of the picture has been hugely beneficial to the Russians' political machinations, along with the retirements of Cap/Lan, Weav/Po, et al. It will definitely be interesting to see what happens at Montreal Worlds re the chances and placements of Gil/Poi, Cho/Bat, Hub/Don and S/B.
Regarding other up-and-coming U.S. teams, they aren't seen to be as strong (largely because of their youth, not because they aren't good). In any case, they are more easily disregarded or stymied. It hasn't helped Hay/Bak that they didn't come up with material which may have at least kept them in top contention, instead of dropping amidst the ranks of strong, hungry teams. Although Car/Pon have Shpilband's political know-how and wiliness in their corner, they are a young, growing team who are still improving and learning. As well, Mc/Carp have been injured and did not get off to a good start this season after doing so well and beautifully contending for the GP podium last season (winning bronze at GP Finland). Obviously, that made no difference to judges' perceptions of M/C this season at their only GP, where they were apparently scapegoated to last place (please save those arguments as to why the judges placed M/C last at NHK -- in part, it's simply bad luck along with politics). Meanwhile, the new team of Green/Parsons are showing a lot of promise, but they are unlikely to make huge headway internationally in this current quad, particularly in view of the increasing depth and political maneuvering that's beginning to dominate ice dance once again.