This part of the future makes me feel very claustrophobic. I honestly don't know if I could ever step foot into one of those capsules, and I don't have a diagnosed phobia* or anything. It's just... jeepers. That said, when I think of the dangers given the parameters set out on the page (e.g. NY <=> LA in 45 mins), one would be travelers suffering acute medical emergencies, such as a heart attack, en route. And then I compare same to air travel, which takes far longer than 45 minutes - even to make an emergency landing - and can't find any reason for this NOT to happen, given proper safety measures, etc. Do you anticipate we'll see this even at a small scale before, say, 2050? * and are phobias diagnosed? Never thought of it that way before. NHS suggests phobias can indeed be formally diagnosed.