Isn't it more logical to slowly increase the top-20 to a top-N?
Another interesting concept could be moving some of the DPOS to POS. I think APR is a good candidate. I find myself voting for witnesses I know hardly anything about, including a few without a price feed, because the high-APR votes of the witnesses I know more about and respect is just too much outside of what I feel is good for the chain.
It would be far more complicated to increase the size of what I call the (aka. Top20).
Better to just implement the vote dilution to all votes cast beyond a future Hard Fork.
Also, APR is voted by witnesses, and you can openly see the vote. You should vote for witnesses that agree more closely with your position. But I agree that some decisions should be by a larger council. Let's say, the Top100?