Woahhhhhhhhh, in no way, in any shape or form, at all, is Bergeron close to the player Iggy was (prime/peak/whatever). In no way is that type of player better for a team simply because he won a cup (from the 2nd line at that).
He wouldn't be a Sedin replacement, but a Kesler one, who's also better than Bergeron. Ain't no Iggy though. Kane is also already proven to be a great player in this league. That certainty comes at a cost. Bo is more likely to be a 2nd punch, ala Kes/Richards/Couture/Bergeron ect. We still need the top scorers infront of him, and the overall team. We have most of that now, likely wont if we have to wait several years for a prospect to hit his stride.
Not that I think any deal there is available, pieces moved in the past may have got it done, but Peg has no interest in moving Kane for a prospect like Bo even with a hefty +.