I agree with the overall sentiment here that a Marner trade needs to be explored. However, we cannot get locked into having to trade him. We have to receive a fair offer if we are moving him out, he is still an elite regular-season player, and one of the best RW in the game.
On another note, not sure how popular this take will be, but I believe that trading Mitch should also be related to contract negotiations. If he is willing to take a substantial discount to stay, such as 10 million by 8 years, I would resign him. If he wants anything over what he is getting now (and I am sure he will) we have to move him out.
What we should look for in a Marner trade:
A RHD under 27 who is legitimately 1st pair quality.
A potential first line center.
Additional picks/prospects.