Yes about BIP and its very dangerous 75% "supermajority":
5. Summary
As it stands, the BIP101 has implementation flaws that could cause BIP101 activation with a significantly sub-supermajority, or (in the presence of fake BIP101 voters) a minority. It is almost certain that if BIP101 is activated, it will be with a sub-supermajority, or even a minority.
http://organofcorti.blogspot.ca/2015/08/bip101-implementation-flaws.htmlThis blog post shows that the probability that BIP101 gets activated and it does
become the longest chain (due to variance) is less likely than the network hash power finding a SHA256 collision: