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.