Your suggestion that prices are 100% certain to crash when we leave the EU is pure conjecture and fear mongering. It is Project Fear on steroids.
I never said this, though I think it is very likely, though not certain. Likely enough, however, to make it extremely silly to take a risk on.
What I have been talking about is the fact that the uncertainty about what Brexit will look like, and the lack of confidence that it will be end up good for the UK (especially given how inordinately inept the govt have been in its negotiation thus far), is having an effect now, and will continue to do so for the next few months. This has already started, but is yet to ripple out.
What remains to be seen is what happens after Brexit, but certainly enough people are sufficiently worried for there to be a significant slow down in property transactions.
With regard to your claim about 'conjecture', this is of course all we can do at present, given the bone-headed way Cameron breezed on with a Brexit vote without anybody having the faintest clue would it would entail (though enough people were happy to take a wild leap in the dark with the nation's finances and future - no doubt because most of them were clueless about how serious the ramifications could be, and had been brainwashed that anybody sounding the merest note of caution was 'scaremongering'.) Your own thoughts on the matter are also, of course, conjecture.
Using terms such as 'scaremongering' and 'Project Fear' to people who are genuinely concerned about the country's future, and actually have professional training and experience to be able to form an informed opinion, makes you sound like you have uncritically swallowed the rhetoric of the likes of the Daily Mail, and are just regurgitating it, without much thought.
You do realise that when great swathes of the population are mouthing sound bites dreamed up by political spin doctors - and believe them - that there has been a very successful PR campaign to divert people away from facts, and towards emotions, don't you?