RPGs are fun.
Learning a new system, or writing an adventure/campaign is fun if you have the time, which most of us don't anymore, and some of us are going to even have less of in the future with new bundles of joy on the way.
My solution, which has been proposed before, is to run some sort of persistent game that can be easily picked up and put down between our infrequent gatherings. I liked attending the Saturday online game for DCC (and to a lesser extent, Fiasco), but making that a regular thing is impossible for me with Wylie given that we fairly regularly have Saturday, Wednesday, and Thursday night baseball games along with school, family time, swim lessons, etc...
My proposal is to pick a system, any system, and fire-up the Worlds Largest Dungeon or some other huge module (Undermountain?) that will persist between sessions and since there is somewhat of a low story and low need to remember minor NPCs, small story snippets, etc. we could play it for years to come, have fun, roll some dice, and keep RPGing alive.
Savage Worlds? DCC? Worlds Largest Dungeon?
Hero System, 5th Ed? Ha!