If we actually ever do want another referendum we can get one. The same people who pushed for this referendum will do still be there determined to get another one. There are no constitutional barriers to that, and it is entirely a matter for this country to decide, and this will always be the case under the treaties that underpin the EU.
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Obviously those who want to see the Leave vote succeeding will be confident that everything will go well after leaving, Stanron, otherwise they wouldn't vote that way.

Those voting to Remain will be made up not only of those who are confident in the success of the EU, but also those who do not share Stanron's optimism about the inevitable benefits of leaving.