It is a tricky situation. We absolutely can't take steps back into a 're-build' & have the locker room disgruntled again like after the Markstrom/Tanev/Toffoli departures. And we also cannot let Miller walk for nothing.
If they sign the Zibanejad deal its going to be an anchor at some point. I think you either need to get something that's favorable for the team, or move him while his value is still sky high - that means a resolution in the summer. I'm not sold trading him is the best bet but we also gotta be wary about saddling ourselves with a boat anchor & limiting our window.
I agree with aGENT that trading him =/= rebuild. If you get a young NHL ready player in the deal then things can look pretty good very quickly. Look at how quickly Suzuki materialized for MTL, or how Tuch/Theodore were impact players for Vegas right away. (Krebs in Buffalo is looking the same).
If we trade Miller getting that type of piece is paramount, then the other assets can be developed as futures or flipped. It can't be just lottery tickets that leave us 2-3 years away.