Should the launch have been delayed? What else could be done?

[DPZ2]

How would renting servers, then returning them work. I am not exactly sure how it all works but doesn't a server = a world? So say they rented 5 servers per data center, ... how would you convince players to transfer to those new worlds? Players want to play with their friends, with their fcs, and those who have houses sure wouldn't want to move to a new server, especially one that was going to be returned after a few months?

Given my understanding of how such servers typically work, it isn't 5 servers per data center. It might be closer to 25, or 50. Think "how many instances have been spun up for leveling areas at the moment". Each of those instances may have their own servers. There's a reason there's a black screen every time you enter a dungeon, for example. You're actually moving to a different server (virtual or not).