Staff had such a discussion before actually on that idea and others (this year in fact, and before that), but there's some issues (e.g. mixing between different hardware for games, varying game mechanics, etc.). Pros and cons with each set up, although personally I prefer the current one, and there's always one section that has to be at the bottom. I think it makes much more sense to have newer games on the top as that's what people are playing, rather than a mix of new and old everywhere.
(Personally as well I'd rather XY/ORAS and etc. be higher than Pokemon General...)
(Personally as well I'd rather XY/ORAS and etc. be higher than Pokemon General...)