Then how will you know if it should changed or not? If I want to change a variable case, I just do it and they all change. Your way, you would have to assign that case to the first time the variable was used in the program. What if that first use gets erased? You would also have to make the IDE remember each variable case in this scenario.
Personally, I don't care about this issue either way. If I had to choose, I like the new method a bit better but not if it means more work because of what I just brought up.