Terminals have been 'going away' for longer than I've been alive, and they will continue to diminish long after I'm gone.
The reason they don't ever get there is that the market as a whole is still increasing in size overall, even as the stock of TUI-natives dwindles. There are simply so many more people working on e.g. neovim, kakaoune, and himalaya (an email client) that the fact that there are even _more_ more people using GUIs simply doesn't matter as much.
Put another way: the increase in absolute numbers of TUI/CLI users is the statistic to watch, not the relative percentage of users.
Finally, terminal chops are a nerd status symbol -- a form of conspicuous consumption of time and muscle memory. Humans tend to drop status symbols _last_.
I don't brag about my use of VSCode, but I sure talk up my neovim config in interviews ;D