Well, you've set out the Remain argument succinctly, Fing, and I've just heard Anna Soubry on TV saying the same thing, and I don't envy you that company.
And yes, I've heard the democrat threat like I heard Obama telling us we'd be at the end of the queue. I doubt it would be an issue if the UK gives an undertaking NOT to put a hard border in Ireland.
We haven't got long to wait. Whatever you think of Boris, I don't think he'll fold because he can't afford to. He'd bleed votes to the Brexit Party like a fountain. But on the Germany argument, there are elected politicians looking at this, and their prospects if Germany goes into recession. Personally, I think that it will tell. But not yet. October 31 falls on a Thursday. Expect feverish negotiations and attempts to compromise the previous Saturday. That's my best prediction.