The server split has nothing to do with JSP.
Recently it was proven that JSP is not against D2R terms of service as well, so all the haters that can't understand why it is used as a reasonable medium for trading can suck it. They are just salty they cant farm enigma in one sitting, and that the things they want have prices/values.
Server splits have to do with how Blizzard are (supposedly/hopefully) re working the underlying code, reformating save states to the global, and ultimately trying to prevent crashes and massive ques... as per their post a week ago