They're already implementing the ability to face people in the same data center for LoV and TT. They mentioned it in the patch notes. Search for the term 'Battlehall'

As with the Yo-kai watch event, everyone was storming to do them at the very start. The event ends very soon on October 3rd, those that wanted the stuff already have them by now, and others either didn't care, or only got what they wanted.

Plus there's the fact that it's been a good while since the last update (Not including the one being worked on right now), and all servers tend to die down a bit when things get 'stale' for current raiders/ect.