Oh no, let's not. Let's not turn the Linux desktop into a locked down Microsoft or Apple shithole.
Because, IMO, it is one of the most beautiful features of the ecosystem. If you get tired of KDE, you can easily switch to GNOME on the same system and still keep all the things you care about. And if you decide that GNOME is not your thing you can easily revert back on the same system. And unless you are running Gentoo (wink, wink) that only takes a cup of coffee on modern hardware.
Better yet, if you get tired of both you can get something like Mango (https://github.com/DreamMaoMao/mangowc) or Hyprland (https://hypr.land/) and hack your own DE together, or if you really have spare time to shed you can pick up something like QuickShell (https://quickshell.org/) and build a DE pretty much from scratch all by yourself. That's how caelestia (https://github.com/caelestia-dots) came to be, which is also prominently showcased on the QuickShell homepage. It's just that beautiful (and useful too).
Speaking of useful, from someone who installed Linux for the first time way back then when CD-ROMs and Windows XP were still things and Slackware was the most popular distribution the UX of all desktop environments has improved a lot.
And that's actually a understatement. I'm currently migrating (for real this time, and for good) and also want to ween my parents off Windows 10 so I casually slapped a KDE Neon live CD on a USB stick in order to demonstrate that the UX in Linux has improved a lot over the years and is nothing to worry about.
After booting up from the stick I was absolutely blown away myself, because of how good it was. Hell, I can imagine if less people get freakish about Linux a lot of people will finally make the switch. The UX IMHO is so damn good compared to Windows 11 or current OS X for beginners to advanced users alike (in case of the latter meaning that if you want to customize your shell to oblivion within the borders of KDE's UX guidelines go right ahead, nobody is stopping you)
TL;DR: Nothing needs to be changed. The only thing what is required is that people learn there's more than macOS Big Sur or Windows 11, and that these alternatives are just as easy to use.