Like all delusions, this will continue to entrench itself against reason. When the negotiators fail to reach their delusional goal, the deluded will formulate a conspiracy narrative to protect their delusion.
This is a false assessment. The European Union Referendum Bill 2015-16[0] specifically states:
"This Bill requires a referendum to be held on the question of the UK’s continued membership of the European Union (EU) before the end of 2017. It does not contain any requirement for the UK Government to implement the results of the referendum, nor set a time limit by which a vote to leave the EU should be implemented. Instead, this is a type of referendum known as pre-legislative or consultative, which enables the electorate to voice an opinion which then influences the Government in its policy decisions."
[0] http://researchbriefings.files.parliament.uk/documents/CBP-7...