Canes fan here. I think we have a higher chance this off season since Trocheck's contract is expiring, and JT Miller would be one of the best, if not, the best replacement available through trade or free agency. Both players are only 1 year apart with Miller being older, Miller is much bigger (which our team needs), and on average he takes less penalties than Trocheck (who is one of our most common penalty offenders). So, there are multiple things besides just the point production, particularly with last season, that make Miller an appealing replacement for Trocheck.
I'm not sure what Vancouver wants, but I'd be fine with trading:
Necas
1st round pick in either 2023 or 2024 (ideally, it'd be a 2023 2nd round pick so we have another big trade asset and plus we don't have a 1st this year, but I doubt a 2nd round would be enough)
Drury or Suzuki
If that wouldn't be enough, I'd consider replacing one of the assets with something Vancouver has a higher desire for like a defenseman (not Pesce and certainly not Slavin though; so probably just Skjei), or maybe our promising goalie prospect with Kochetkov, but he'd probably be the least likely prospect traded at the moment. I'd also prefer to keep Koche for now. I might even add one + to the above trade proposal depending on other moves by Carolina in the off season, and who Vancouver wants.
If we get Miller, Carolina realistically will not break the metaphorical bank to get him in a trade since that's not the team's MO. Also, on a side note, if we do get Miller, a dream case scenario as a Canes fan is we also sign a free agent like Forsberg namely. Our top 6 forwards would have a notable improvement. If not, maybe we go after Chychrun or a similar tier defenseman and replace Skjei with him on the 2nd d line. In either case, that would be amazing IMO.
Finally, there are some factors reducing the likelihood of the trade for Miller with the Canes. Namely, it's important to note that Carolina is unlikely to give up so many pieces in a trade for a UFA with 1 year left since it's so uncharacteristic of them, and especially if they don't think they will resign him. Also, even with Trocheck possibly not resigning with the team, Carolina might (maybe even probably given his extension) feel comfortable slotting Koko/KK as the 2nd line centerman.