Why? Why is it uninteresting or inconsistent or wasting the character to allow him to end up with a happy ending?
I think Solo was a character who would have to change in order to have a happy ending. And, we love him as the selfish rogue. Once he discovers something bigger than himself, I think it would’ve been compelling to see him sacrifice himself.
Which him grow old telling stories of the past as he barbecues sounds terrible to me.