I'll be as happy as anyone here to see him gone, but he's still a good #2 centre this season. If he's willing to be properly team friendly, I don't hate the idea of bringing him back...provided that he doesn't suck in the playoffs again. If he's invisible in the playoffs again, yeah, just go.
When I say properly team friendly, I look at Kopitar's 2 x 7 (while being better than Tavares) signed last summer as my guidepost and even then, as I said, I'm only interested if he's good this year in the playoffs. For all of the shit the rest of the 4 have taken, they've all had stretches of playoff success, they've all had series performances that were strong...except for John.