Yeah, people need to stop trying to think of solutions to problems that don't exist. I see the Brightline marketed to families for travel and day trips, and I'm like "OK, this isn't the 1950's." Driving is more or less fine for a day trip if its within 4-5 hours with multiple people on board. Plus, if its for recreation, it doesn't have to be during rush hour.
What the major cities need is commuting relief. We're getting crushed by traffic because millions of people climb into a huge hunk of metal, and operate it for two hours a day on crowded roads. The goal should be getting people from their home to work and back with rail. I'm not as worried about recreational travel, as they can use all 24 hours in a day and 7 days a week to spread the traffic out, and they're fitting more people in per car.
Plus, as people were saying, flying is already a pretty attractive option that a train can never compete with for longer distances. Trains really just give a benefit for short-term distance.