There would be fucking uproar, especially given that, with the exception of a few idiots (notably Ken Clarke, who's standing down at the next election, and Tim Farron) every MP who's spoken since the referendum, be they leavers or remainers, has said that the instruction of the electorate must be implemented.
Yes, there would be uproar. But what, if anything, would the voters actually DO about it? Would they still be so mad four years from now that they'd all defect to UKIP? I doubt that, myself.
SNP, sure, but NI is a different matter, given that most of them are DUP, who campaigned to leave.
The voters voted to stay, though, and there has already been some talk in NI that they might go for independence rather than be forced to leave. Maybe it will amount to nothing, maybe not.
No, she couldn't. She has explicitly said that "Brexit means Brexit". "Not my fault" is not Brexit. There's also the little hurdle of a leadership election to get over first, which she might lose precisely because she was a remainer.
It would take the space of one day to spin that into "the situation has changed, and since Parliament has spoken the issue is settled for now. The voters will have their chance to respond at the next election, if they choose to do so. Now on with running the country."
It's certainly speculation, but I think some version of that is what will ultimately happen.
Give a man a fire, and you keep him warm for a day. SET a man on fire, and you will keep him warm for the rest of his life...