What do you think about a GigaMeleeRumble?
Regarding switching to a newer client and wiping the rumble data... I suppose the question is how many of us are willing to contribute to get the scores back to stable state.
For the main rumble I think it'll take in the ballpark of 2156000 battles to get back to the stable point (~2000 battles per participant). At a rate of 1 battle per second it would take 25 days to get back to the stable point. I imagine we could do better than 1 battle per second if a decent number of us chipped in (remember, the bulk of the robots are very simple/fast).