I think the problem might be derived from numbers usage itself. Frequently numbers between 1000 and 2000 get used that way in just everyday life. Fifteen hundred boxes of tampons. But nobody says twenty hundred balloons

I do sometimes say the year is twenty ten, but more frequently I use that when referencing future dates. I think that means my mind is being controlled by my future self. Apparently in 2015 I have conformed

Edit: On that note, I don't find it odd to say twenty-one hundred. Just something about twenty itself sometimes. So I don't think the next century will have this problem, if that helps