It's fun to look at, but the trip from LA to New York would be about 13 hours -- and that's ignoring the time stopped at stations and assuming you can go 220mph the entire trip. New York to some other city would be even worse. For example, New York to Seattle and you're approaching something like 20 hours. I really love trains for short trips (NY to DC), but I just don't see the actual demand these long distance line…
I'd take a high speed if it was cheaper than flying and didn't require all the security.
Contrariwise, if we are that committed to TSA, whatever brain-dead political calculation forced us to waste an extra hour in the airport before every flight would almost certainly cause us to do the same before every train trip.