What about all those other companies not being Google, Apple and Microsoft?
Do they not get a 'significant say in the standardization process' because they don't have a web browser? And if not why should those who have a web browser get a say? Much less a significant one? The only way this matters is if you extend the capabilities of your browser outside the standards process. So if everybody would follow the standard then that wouldn't be a problem.
No more Microsoft sites that only work with IE (remember Active-X/COM objects?) no more Google using features that are only present in Chrome to cripple Google docs on Firefox.