He is right in the sense that building the tram lines was lack of vision for the future. After a certain size, cities need public transportation in a dedicated lane. But a metro line doesn't replace a tram line. They complement each other. Trains, trams, brt, bus and micro-mobility complement each other in commuting.

The best time to build the metro was 100 years ago. The second best time is now. If musk's boring company can build metro lines, so be it. Shit like las vega's loop isn't an alternative to anything.