what does coming to a middle mean - I would take it to mean that if you will have a range of 2000 consecutive days of not wanting to visit the US you would be at day 1000.

It's a joke from a TV series called Friefly[1]. It's just a funny way of saying "I didn't {x} before, and that hasn't changed."

[1] https://www.youtube.com/watch?v=o9ZgnVb5Q7I

Firefly

https://www.youtube.com/watch?v=o9ZgnVb5Q7I

It means he stopped wanting to visit some time ago, and after a similar duration from back then to now passes he will like to visit again.

Yep, I mean there were a lot of good things about the U.S. and I'd like to go back someday but stories like this would give me pause even if COVID-19 wasn't running rampant and social unrest amplifying.

Also Firefly, though.