Why on earth would we trade Pettersson? I don't know what's wrong with him, if it's an injury, a confidence issue, the fact that they've been giving him two plugs to play with, or a combination of things, but trading him away would be one of the stupidest things we could do. He will be back, it may be too late for these playoffs, but he WILL be back and we will need him if we want to be a sustained playoff team.
It's not like it has anything to do with him "not being a playoff performer". He wasn't performing in the last 6 weeks or so of the season, his play completely changed for some reason. And, last time we were in the playoffs, he posted 18 points in 17 games.
You don't give up on proven players like Pettersson due to a bad stretch of games. Look at a guy like Boeser, most Canuck fans wanted him gone after last season, and this season he rebounded with 40 goals scored in the regular season and an excellent playoff performance so far.
It sucks what is happening with Pettersson right now, but let's not over react.