Thanks for the open mind!
In theory, "very small number of crunchers" is one of those metrics that could result in an automatic delisting / greylisting. E.g., if a project runs for X hours / days and doesn't gain N% of the network, then exclude it. Or maybe a project has to have N% of the crunchers running it for a certain amount of time before it's automatically included, to prevent people from spawning little zombie projects just to steal GRC from the network.
Surely we can figure out how to do this without requiring a human to press the button.:)