I don't think being the son of Superman helps Jon in this case. Ok, we can assume than Superman never is going to retire (not unless it be in an elseworld or a potential future), and it is more possible than they reboot everything again before going that route. Jon, being the perpetual heir to the thorne it becomes aproblem of his own by always being the heir to a throne which never is going to be left. Meanwhile Connor is tied to one of the most famous Superman stories and two, his origin don't demand than Superman must be married or engaged if the case of a new reboot ever happens (a possibility we can't leaft out). The existence of teen Jon is more problematic for him than for Kon.