The only way it will come back is if the intercity travel keeps getting better and better, and even then routes on the coast may work but once you hit the midwest the distances get unreasonably far.
Chicago to Los Angeles would be ten hours at Nozomi speeds assuming zero stops. Even the proposed California high-speed corridor doesn't have much to offer.
For California if they could do SF to LA in ~3 hours, that would be a huge change since the current drive is about twice that (and extremely boring from my drive last week). LA to Vegas is another route that should exist given the massive amount of 45 minute flights and cars that already do that.
Personally I'd rather have a slow train that kept schedule than a fast train that rarely did.