I have sort of assumed early on that the team narrowed in on Miller being the biggest issue very early on. I'm not sure Pettersson was ever really on the market beyond a "I wonder if someone will give us a crap load for this player" type of way. Which of course most every player is in that category.well that's news.
Play wise while his offense has obviously been a struggle his defensive play has remained and perhaps has even improved. I think you stick with him to see if you can get him to a 80ish point Selke level center (Barkov-esque).