Can Toronto afford to keep Campbell if teams offer him this

I don't think so at 6 million.

I will shoot myself if Campbell leaves. Between Hyman, a lack of post season success, and years and years of pain, the Leafs deserve atleast one good thing.

On a more relevant point, I think the Leafs likely try to sign Campbell before the offseason. He likely (hopefully) takes a slight paycut considering he evidently likes Toronto, but we are still looking at 5 × 5 here. Toronto can easily facilitate a cap hit like that by moving Kerfoot, who has quite a bit of value, and Holl. Campbell wants to stay in Toronto.

If they extend him before July 13, other teams won't have a chance to make any offers.

yes, they can by playing to dump bad contracts. i don't know if they will tho

Makes sense, and I hope Toronto is able to do sign him before free agency. It's just that Jack has waited soooooo long to get his shot in the NHL, he's never been a bad goalie. He never got a fair chance in Dallas, and he had to compete with Quick and Peterson for years in LA. This in Campbell's one shot at a big payday. Guess we'll wait and see