Really? You'd like Tizen to take Android's place as the dominant mobile OS?
Honestly, I hope this never happens. If there's one thing I hate about Samsung phones, it's their software. TouchWiz doesn't have a single application that is not either an inferior version of the vanilla Android app, or inferior to third-party software that is available for free on the Play Store. If there's one company that needs to stick to hardware, it's Samsung.
Think you are getting two arguments mixed up - Samsung making its own OS is one thing, Tizen vs Android is another. All the manufacturers customize the OS, Tizen is just a better planned base than Android and will have better compatibility with Linux Apps as it is more "in tune" with Linux development.