Don't forget the affect the first part of the proposal will have on SPS value/prices!
If, as you say, the # of accounts playing in Wild drops from 75K to 13K- the amount of SPS rented should also drop by ~80%, as long as the multiplier remains the same. By halving the value of staked SPS while reducing the demand- I would expect a drop in the volume of rented of ~90% with a corresponding drop in prices for renting SPS.
On the bright side- with zero incentive to hold any staked SPS, all the accounts in Wild should start unstaking and dumping their SPS immediately.
(I could quibble with the 13K number but in general, I agree- only 10-15K accounts could continue playing in Wild and they would all be bots/botted accounts that spend 0 on rentals and 0 on SPS)