Its about network effect - The biggest issue is that ChatGPT is a household name like Google at this point. Everyone and their grandma knows it or are learning about it, while Claude is very well known in the tech circles. Getting tech people to switch is relativity easy (ignoring Enterprise contracts), but getting everyone else to switch is going to be very slow.

Honestly, the best thing to happen is that someone comes up with a new UI (think claw...like) that everyone starts using instead. A very cute, well integrated system that just works for everyone, has free tier, and has something that the others dont have.