You know, I gotta agree with misslane on this one. The Super family has seen enough needless loss and trauma. After what happened to Kal-L in Infinite Crisis Id rather not see yet another former Superman get screwed.
I'd rather they all go off to their own world, but if Jon has to stick around (which Im fine with on its own) I dont need him to have a great big pile of sad thrown on top of it. That's not what Superman is about.
Just have Superdad (I love that that name has become a thing and as far as I know I started it ) lose his powers and stay in the background with his wife. If he doesnt have his powers he's not stepping in on Superman's territory. He can be a farmer, Lois can stick around as "Author X" (hopefully with a name change that doesnt suck) and Jon can have that post-Crisis family vibe that so many confuse for "classic" Superman.
Hell, such a thing might even open up a little more wiggle room for the current Superman to step further away from that wrong-headed characterization.
Not to say your idea doesnt have merit, and if they do go with that or something similar it could still be good. But I for one have seen enough tragedy in the Superman line; that stuff and its "this one bad event shaped my life forever! Darkness! Orphan!!" stuff can stay in Gotham where it belongs.