A few points:
You don't need a super majority for a softfork to lock up stake. You just need a normal majority. (Longest chain wins).
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.
RE: Let's change 1SP 30 votes (current) to 1SP 1vote