I was thinking of a game with vaguely realistic money gaining method - you'd be gaining referrals, who would passively gain you money each day (bit of an idle game). You'd maybe gain energy by developing your energy source, then spend it to gain game world referrals.
I was thinking a small game, maybe made in three weeks.
I saw a game on the scirra arcade here that was about making videos (by just clicking a button) and gaining subscribers, which had a fair few plays.
Or is there something else you guys are anticipating more?