I don't think it will come to pass, but all this Karlsson to Edmonton rumor mongering makes me damn envious. It was an impossibility for many reasons back in the pomp of this team's cup winning years, but getting him in 2016-18 would've put this team into the stratosphere.
That said, I still think its insane that the Sharks are demanding a huge return for him. 1 year ago, they would've been happy to pay a bribe and have someone to take him off their hands. All to be done with that massive contract on a bottom feeder. And now they want premium pieces because he's rediscovered his form after 4(!) fairly underwhelming seasons?
They should be glad to get any positive return in trade value for him. Nothing exorbitant: a collection of picks, some (easily flippable) roster players, and decent prospects to accelerate their rebuild. Maybe with 1.5m in retention thorwn in. Before he turns back into a pumpkin and his remaining 4 years become unmove-able once again.
Personally, I think it would be a shame to see the guy's waning years wasted on a cellar dweller. Even if it is Edmonton, at least he would be competing for a cup.