If SE is going to keep Dynamis going and keep merging servers, they better get their act together and make Dyna an instance like in WoW. Trying to coordinate runs with several thousand other people is kind of a serious pain, especially since we don't all speak the same language.
Did you read the news post at all? They're already changing dynamis so you don't need to schedule runs anymore...

It's not going to be instanced. It's going to be an open area with the bosses being popped NMs.