I mean I've been Miller's biggest fanboy for a few years now, but sure, in the right deal you move him. He has enormous potential but he's not some generational talent. Someone wants him as a main component of a deal for a young, stud C and you definitely consider it (depending on the other pieces).
I said it in another thread, I think he (and lots of college guys, honestly) are criticized a bit too harshly. He started off great--not perfect, but great when you look at the circumstances--dipped in play, picked it back up, and then fell off a bit of a cliff. He's a college guy, though, used to playing 40-ish games over a full season. Playing twice one weekend, one game the next, twice the next weekend, then having a weekend off, etc. The physical and mental grind of going from that type of schedule to an NHL schedule is a huge change for a guy, and forget about in a weird COVID year without a real ramp-up.
Seems like the final 15 games or so, we had a couple vocal posters who seemed to gleefully bash the kid for every mistake, which is a really weird thing to take pleasure in. Considering no one thought he'd even make the team, and then he's there playing 20+ minutes on the top pair, I'd say he blew past expectations and then some.