As the sites grow the user hierarchy will inevitably take on more of a pyramid shape with less users with "moderator" and "close" privileges as a ratio to
Therefore it may be necessary to "lower the bar" to allow more users to help moderate the site, close bad questions etc. I think we can all agree this would be a bad idea.
A slight tweek to the
move question algorithms that allow question to be closed (or moved) if the total amount of reputation of all those users requesting the action is greater (or equal to) 15k.
This would allow 15, 1k users (not a trivial rep.) to close or move a question, thus relieving some of the workload from the increasingly diluted number of 3k-ers.
The total of 5 votes should still be kept in place so not to give the 3k-ers too much power.
(votes ≥ 5) && (sum_voters_rep ≥ 15000)
NB: I have been reliably informed that only 3k rep is required to close questions. Maths updates appropriately.