You can’t blame the remain vote for the complete lack of Brexit plan by the people who proposed it.
Cameron, if he had enough of a brain to dig himself out of the hole he himself created, should have said, "Vote Leave have a month to come Downing Street with a document at least as detailed and as heavy as the indyref document published by the SNP before their referendum. This document will then be independently reviewed over a period of one year. If the plan is viable then the article 50 notice will be given."
And Vote Leave would have had a month to come up with something which isn't unicorns and rainbows, and as we know know, would have been impossible.
But instead he said, "We'll have a new Prime Minister on Wednesday, do-dooo do-do, right, good" and buggered off.