Clementine One of the problems was the noise, it was very loud.
Looking at a picture of it that would make sense, it looks LOUD!
A new version using electric power could be almost silent though, and would be a much cheaper alternative to MAGLEV trains I think.
All of these things, hyperloops, hover, MAGLEV, etc. have one problem in common, which is that they need new tracks (or tubes) wherever they go instead of using the existing railway lines, so traditional high speed trains are always going to e an easier option.