Colorado is in the cellar with the 5th lowest attendance in the league. They need to dump salary while getting assets back. A combination of high draft picks and young NHL ready talent will be what fetches Landeskog.
Value-wise Muzzin should be worth Landeskog. Similar level player but more important position. Remember Adam Larsson got Taylor Hall. If the Kings add more something has to be coming back as well.
That trade happened in a completely different set of circumstances though. It wasn't value for value. Edmonton needed to clear out the face of the floundering franchise, and they knocked it out of the park with that deal.