I personally would love to have more than 8 character slots per world. I am one of those people that enjoys playing each and every specialization of a class that there is because they are all different in terms of game play. The fact that there is only 8 does not help the fact that I also had characters on the destination server (since mine was rather low population after D3 came out) and I was maxed out on my original server. I had to leave 4 characters behind (26, which I am sad about, 23, which I am also sad about, 17, and a 14) because I had no room.
In order to actually play some of the other classes I have to play on another server (Drooga's) so I can enjoy them, but none of my other guildmates/people I know play on those servers. (I know two on Ebon Hawk and that is about it.)