Also, supersonic air travel already exists. It’s not a technical hurdle anymore and the Concorde was even profitable in her later years.

There’s a lot of research addressing the very real problems you pointed out and it seems plausible that they’ll at least be mitigated to a degree in the near future.

Hyperloop is a (vacuum) pipe dream. It sounds super cool, but the more you think about it, the less realistic it gets.