Rather some other team pay Wilson's retirement contract unless he comes at a substantial discount, caps don't really need to be getting into highly physical back and forths with Ovechkin, Backstrom, Oshie and Carlson being what they are at this point and the rest of the team consisting of more finesse than physical players
That said, he should fetch at least what Lucic did when he went to the Kings (mid 10 first, young #4/5 D level player, and a goalie worth a late first and good 4th liner) value wise. Lucic was probably overpaid for but Wilson is better now that Lucic was then and any team getting him would be coming with an extension