Even $100,000 would kill it. If 1 sat (or even 100 sat) == $1 then the fees would grind the system to a halt. The fees would be so high relative to the amount sent, that it wouldn't be worth it. From an investment perspective 1 sat==1$ i
Actually, 1sat would be $0.001. and not $1 as you pointed out and 100sat would be $0.1 which is yet still very okay and reasonable when bitcoin hits $100k. And this will reach it in the future as more users and adoption comes.