Hyperloop De-hyped
ti.org
ti.org
1) The problem with aviation for routes like SFO-LAX is not the TSA (which could be solved), but airport capacity. Without huge capital upgrades (which are infeasible, and would be well more than $10b per airport due to surroundings), you can't really handle more planes. It makes more sense to use SFO slots to fly to NRT than to LAX. You use smaller planes for SFO-LAX than you do for SFO-NRT, too (although I guess you could use something like those crazy high-capacity Japanese 747s, maybe with turboprops...)
2) On the SF side, there's a reasonably well developed infrastructure of public transit to tie in.
3) Hell yes I'd drive or BART/Caltrain from San Jose up to SF to take a 35 minute TSA-free ground level trip from SF to LA. If I could do SF to Las Vegas in 55 minutes with a 5 minute layover, I'd be even happier. The alternatives are a 5-7 hour drive in my own car, or an equivalent ground travel to an airport, pain with TSA, flight.
4) There are specific routes (downtown SF to LA, LA to Las Vegas) where there really are essentially huge volumes of people who want to swap location frequently. This doesn't replace all air travel, it just replaces those routes.