Kami3kWhy not just it so you can play with people from anywhere in the world on just one server?Guess I'm getting old and too use to when gaming made sense.
There are a couple points that fragmentation in servers is a good thing. Lag for one. Say you only want to play with neighbors or something, you can all be on the same server and keep a low ping. If there was a global server, ping would be low for some and very high for others depending on where the one server was hosted. Giving players the option to choose servers is the best solution, it allows people to play with low ping with neighbors, and if so desired, a higher ping with people across the globe.
Blizzard decided to face the facts and deal with issue of selling directly, the entire mmo gaming industry is watching to see what will happen with RMAH, just like everything else Blizzard touches it will be inovative and completely change the way we play the game.