The choo-choo that Herb already killed just needs to survive the legislative session, and it should be go. Environmental review is done in Fall of 2019, and Japan's JBIC has provided the last shot of funding necessary. If Japan Central makes Texas Central work, then watch for AA and SWA to go ballistic, because it's also a testbed for the next target for everyone - JR Group, Amtrak, ODOT and TXDOT's I-35/I-44/MX-85 line. It'll never get built, but even a portion of it would seriously threaten intrastate flying for everyone.
If TCR actually does get built, you'll just see downguages and maybe some frequency reductions form AA to Houston (and AUS/SAT if those extensions were to be built) a viable HSR connection should kill most O&D between the two cities so then AA and WN just need to cater to connections. See the DCA-LGA shuttles as Amtrak make something almost resembling HSR in the NEC. Neither would probably have that much trouble adapting.
Have any realistic estimates of travel time and ticket cost been published for TCR? If so, how do they compare to current flight time and cost?
For time station to station has been listed at 90 min with 1 intermediate stop. That seems about right for distance and the N700 shinkansen. Plus additional time from the stations on the outskirts of the cities to destination. So depending on where you live, probably similar or slightly shorter "last mile" time to airports plus less time than airports from check in to boarding.
TCR claims pricing will be competitive or cheaper than flights, but I'm not sure if it's been independently verified. Capital costs are high operational cost should be good vs planes. TCR says they are purchasing minimal width right of way, so not sure there will be much real estate offsets, so it will have to run on its own merits.
717, 733, 734, 738, 744, 752, 763, 772, 77W, 789, A319, A320, A321, A332, A333, A359, MD88, CRJ, CR7, CR9, DH1, DH2, DH3, S340, ER4, E170, E175, E190/CO, NW, US, AC, NH, AA, UA, DL, WN, WS, SK, VY, LA, QF, AR, AV, MH, KA