Actually your rebuttal  holds no water.  The Prime Minster held a referendum to stay or go.  Now someone is coming along and changing the rules because they didn't like the outcome.  If the Prime Minster was out of line in calling the referendum then this should have been decided before the vote.  

They also say that this will make no difference as the vote in parliament will also be to leave. Meh I live in Canada so I could really care less except to see the voice of the people matter when they speak.  They did speak. Votes don't have mulligans.