A few points:

1. You don't need a super majority for a softfork to lock up stake. You just need a normal majority. (Longest chain wins).

2. It's funny how many people throw around 1SP1 Vote, or reduce to three votes etc without doing the math right now.

If we have 1 SP 1 Vote we will have much less vote overlap than what we have now which makes it much easier for a big stake to push multiple witnesses in the top 20. This way Justin would easy be able to get always not only 5 witnesses but a majority of witnesses in the top 20.

This is not even close to decentralization.