I think a lot of states will be changing things up if they are trying to keep diversity up and need a way to comply with the Supreme court rulings. This 10% rule works for Texas, so why not try it? Another state might want a model more like California where there are the A-G requirements, or the Cal States that have geographic areas where a student might get a preference.
Different states are going to have to try different things if they want to continue minority enrollment levels. If they care.