The parent was me. I like maglev but it's hard to deny that as a mainstream transportation method it was completely trounced for the first 30 years of its existence by more traditional methods.

If California ditches its HSR plans for hyperloop today and ends up with a 700 km/h line running in 30 years' time, busiest lines in Japan and China will have been upgraded to maglev or another 500+ km/h technology and they would have had 300+ km/h technology for the interim 30 years. Meanwhile California would have had what, driverless car trains on freeways going 200 km/h 5 years from now?