You can do it if you want to. Go ahead. No? Why haven't you switched yet?
Yep, there's the problem. Nobody else switched. If you change the rules, you're effectively creating a different Internet. One that isn't entirely compatible with the Internet we all have, which means nobody is on it but you.
This Internet, the one we're using right now, works well enough. There's stuff we don't like, but altogether it works well enough that nobody wants to start over.
If you want to change some rule, like DNS or routing or some other core component, chances are there's a few people on the fringes of society who will play along. So set up your Alternate DNS Root and talk to them. Five dollars says I know what they'll want to talk about.