They can be "friends" in the same way that Wolverine and Cyclops are friends. Wolverine has tried stealing Jean since Day 1, and Jean has always had a crush on Wolverine. Scott and Wolverine even went to war against each other, which is way worse and collateral than Emma nosing into Scott and Jean's marriage, which already had problems.
So yes I'd love to see Emma and Jean interaction, and I'm not even sure if the ghost story counts since it was just a ghost of Jean. It's totally unfair that Wolverine and Cyclops get to be in comics together, and we still haven't seen any Emma and Jean interaction. Totally ridiculous.