Ewww no.
Pettersson is frustrating, but Marner is awful. He's got the regular season consistency that Petey lacks, but also consistently doesn't show up when it matters, and that's something deeply ingrained in the guy. That's not going to change. At least with Pettersson, there's a chance that one of this confident dominant hot streaks will line up with the playoffs at some point. Plus obviously the far more premium position, and just being a mopey sulky brat, rather than a little Mitch.