Honestly the only reason to care has less to do with Jon and more to do how Lois and Clark can explain this to their co-workers without giving anything away (if Clark still cares about his secret ID)
The first thing can easily be explained to the kids as him just moving away. It happens, kids lose touch with each other.
The Planet though. I've been waiting to here an explanation for that given how close he and his parents are with everyone there.