For long distance trains, sure. But there’s plenty of shorter Amtrak routes outside of the NE Corridor where it could make as much or more sense than flying, to be fair

Los Angeles - San Diego: 2.5hrs downtown to downtown (less if you’re going to one of the many suburbs or beach towns in between), which is on par with driving and sometimes even faster than traffic. Also, a ticket is only $30-50, so about a tank of gas. This is likely why it’s Amtrak’s busiest and most profitable route outside the NEC. If the second phase of the California High Speed Rail ever gets built (lol), this trip is to take somewhere between 30-45 minutes.