We aren't Canada.
But, agreed, the EU will have to back down on some of its demands. The cynic in me suggests that they put some of the more extreme negotiating positions in, eg return of Elgin Marbles, specifically for the purpose of giving ground there. The question is what the UK is prepared to give up in kind. It remains true that "No Deal" is the worst of all possible outcomes, so the fact that the UK is prepared to walk away into that outcome is surely a posture rather than a serious proposal.