You can make your own better system which supports GUI and provides a reasonable runtime that works on all current major platforms and provides development tools, years of ecosystem development, etc. etc.
If it's better than what MAUI provides and you can support it for years, I'm sure that could take over and many people would use it instead. But... will you and why?
Anything would be better than another UI toolkit made by Microsoft. They will abandon it in the matter of a few years like they did about 10 times already.
I started moving to using GO and Fyne for cross-platform GUI tooling. GO 1.21 supports Windows 7 with Fyne. Ya still have to support Windows 7 for work. No more wasting time with managing a Windows installer.
QT Framework is still one of the best for cross-platform desktop applications when speed is key.
Like I said tooling. Means that the User is well defined where Accessibility is not an issue. The tooling I creating is for people that have to engage with physical equipment; from replacing parts to making sure a motor is working properly.