If TK can show he can stay healthy, they may extend him instead of trading him - you want some veterans to lead the way on a young rebuilding team, and TK and Couts have the right mind set - and you'd rather pay your own than go sign some big FAs in three years the way the Devils have done the last two summers. Tk would be 29 when Michkov comes over, with a rising cap, so if he doesn't break the bank I can see him staying "unless someone makes an offer you can't refuse" - a late 1st, 2nd and B prospect won't move the needle in a rebuild.
I don't think the Flyers are 5-7 years away, they have a nucleus of young players, Michkov, Gauthier and Bonk in the pipeline, (2) 1st, (2) 2nds in the 2024 draft, and should pick up some more picks at the TDL and before the draft. They are stocked at goalie, already close to nine deep at forward, the one player they really need to find is a first pair RHD.