Chances are EU could need more new worlds come 6.0 by the sounds of it...

"Q. How about EU?
Yoshida: It's about to puncture. Each server is reaching its limit and we have already decided to add 2 servers (Note: these 2 servers are Spriggan and Twintania)."

https://www.google.com/amp/s/amp.red...n_famitsus_18/