It's good to hear that you are looking into this. It's understandable that server load would increase, but at the same time, i guess some types of server load could decrease as well, if people can be spread out over more areas and still see the shouts they want to see.

Then there is also the option of a separate type of regional shout where you are limited to shouting only once per X minutes. That could help with keeping server load down, and ensure that people pick their regional shouts carefully, and don't waste them on meaningless chatter.