Having to drive in bumper to bumper traffic versus chilling in a large chair either working on a laptop, watching a movie or just sleeping (or well if you can't afford it in which case this is very irreverent due to ticket prices).
You have no reliable way to project the cost of supersonic flight 50 years in the future. It will come down. That's all I'm certain of.
I'm sure people told the Wright brothers similar things. You're simply being extremely short-sighted. Which is very ironic since you're also talking about climate change concerns around this post.
There are known, demonstrated ways to reduce rush hour traffic that decrease energy and emissions per person.
Supersonic flight will likely increase emissions per person by a larger proportion than the time saved per person. It's a brute-force energy-wasting solution to the problem.