These are really some valuable points. Being here for more than 3 months, I feel like I'm a part of this community. I understand the importance of witnesses, especially those who are in top 20 position, who run powerful servers to keep steemit going smoothly. As of now people like me have no say as our vests doesn't count millions or billions. By increasing most important positions from 20 to 30 and decreasing the number of votes from current 30 to 10, we can actually control certain things. As @pharesim expressed, even I don't like some people like jerrybanfield continuing on top 20. But I have no say in it.
Number of vests is really important in a platform like steemit and the voice of those having high vests should count. To keep their selection top notch, some modifications as you suggested has to be done. I'm still learning and hope what I said is atleast relevant to the happenings now!