One issue I see with keeping the voting rules as is (i.e. only vCOW token holders have voting power) is that it new investments into COWdao significantly less attractive. Specifically, no future investors can acquire any vCOW tokens (since they were only distributed as part of the initial token distribution in the form of airdrops and ETH/GNO/USDC options). Therefore, if we kept things as is, purchasing COW tokens (even in large amounts) would not give you any voting power with the DAO and would be, IMO, a huge deterrent to future investments (since these potentially large investors would not be able to protect their interests by using their COW voting power).
Just my 2 wei.