No guarantee his play lasts that long but guys like Fabbro could be here 10 years. Also Pettersson may not end up a centre, be nice if he did, but who knows.
Plus to get Karlsson you'd have to trade Horvat+1st+A prospect (Dahlen, Lind, Juolevi)
I’d be more than happy to do Horvat, Lind, and a top 5 protected first next year for Karlsson. Like the man’s still a top 3-5 defenseman in the league so you gotta give to get.