The witness act as the middle man between user and Steemit INc. If the witness instruct Steemit Inc that "said" is the consensus of the proof of stake, that gets implemented.

With reducing the witness vote. If it requires 1 Million Steem to have a witness at number 1 spot. Now a person needs 4 times that to hold the top 20.

A declining vote also produces an lack of equality and punishment for gaining more.

Limited low votes Means 1 account cannot take control,

(yes, there is always the possibility some will come along with enough Steem to do the same again)

Steem Inc right now is no more than a puppet to the Steem Power puppeteer.