Not really cut it at this level just yet as he? Only young still mind. But having seen him a few times between Swansea and England U21, and on TV Championship games, it'd seem a right gamble for me. And that's if he plays regularly, sitting on your bench won't do him much good either!
Reportedly it's Zola who is the big fan of Wilson at Chelsea and is driving any interest they have. I don't know how much power in choosing transfer targets an assistant manager would have? I'm guessing they won't go after someone for good money unless Sarri, and probably even people over Sarri's head, also rate a player.
If he were to go somewhere, no matter how silly the price, it would currently leave us with Josh King (who is awesome in purple patches but anonymous at other times), and a currently unproven and unfit Solanke. Not ideal.
Saints selling Gabbiadini seems odd Harv - He's at least a natural goal scorer, and you aren't exactly flush with those? Got something else up your sleeve?