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The leave campaign in my area campaigned on the basis of getting the EEA option (which is considerably less 'hard' than May's deal) - the oldest Eurosceptic campaign in the UK, part of Leave Alliance, campaigns for exactly the same thing and did so in the referendum too. Even Vote Leave, the official campaign, made claims about getting deals with the EU easily. They certainly weren't openly campaigning for a default to WTO rules.
There is absolutely zero evidence I'm aware of to suggest that the 52% who voted to 'Leave' all had the same thing in mind, and plenty to suggest that they didn't. The best I ever hear is people saying 'Well everyone I know voted to leave without a deal'... which isn't evidence because someone saying that couldn't possibly know why their friends voted the way they did.
Even if everyone voting to leave did want no-deal, though, (which is a very very big 'if') would it really be responsible to enact such a decision if it is overwhelmingly likely to be economically ruinous?