Small problem: the Europeans have had enough of Britains's perfidious ways and are not inclined to being patient. This pandoras box is therefore open for business and cannot easily be be rammed shut again.
As such, with all these forces, this vote genuinely reshuffles the deck, in Europe itself, even if Britain now backtracks.
Edit (I forgot my point and finished too soon :)
If the EU relaxed a little the departing member state may democratically u-turn.