They could just, not. You can't really say something won't work because Relic may mess-up, otherwise we would never get anything new.
Either way, I don't want a Pershing because I like USF as a medium tank heavy army. I'd rather see some fixes to current doctrines and units, as well as maybe the jumbo.
Oh I know, I'm not against the Pershing being in the game, I'm just saying it shouldn't have the ability to decrew itself like other USF vehicles as a trade off for being the most "modern" tank in CoH2.
I do see your point yeah it does kinda "break" the mold of USF a bit but the Jumbo would essentially be a glorified KV1.