It's going to be an interesting offseason in Boston. With the possible departure of their leader Patrice Bergeron, they will have a big hole at center.
Could a player like Kevin Hayes help them fill it? Of course. He has a bit of the same style of play as Patrice Bergeron, so it makes sense. But for the Flyers, trading Hayes would mean that they will only have one top-6 caliber center on the roster in Sean Couturier.
Moreover, the Bruins gave up a lot in the Hampus Lindholm trade, so they don't have a lot of assets to put in a trade.
However, if a trade proposal including Hayes makes sense, Chuck Fletcher should definitely look at it very closely...