This is from memory, but I remember reading several months ago that the EU leadership expressly acknowledged that the Article 50 notice could be revoked at any time, and that they would welcome such a development. It might even have been a G&M article. You do have a good point about the potential for EU strongarming, which would be great. Half the UK deserves to have buckets of raw sewage poured down their gibbering white trash gullets, after all.