I'm probably reacting more negatively than I should to a plan like this - and if someone actually builds a prototype and proves it can be done with awesome sauce I'll be thrilled - but there is a weird tendency to be attracted to shiny new technologies which, despite their advantages (speed) have some obvious disadvantages (low capacity).
I just don't believe 30 second headways are possible. Maybe 2 minutes. So that gives a capacity of around 850/hour.
