As bad as it is, I only have two words for it: blame Balmung. I'd argue that this is all happening because players on crowded servers like Balmung don't want to leave their servers for various reasons.
But community? The upcoming world transfer system means that you can visit and be part of communities on other servers.
But housing? Players will get reimbursed in full and then some for transferring for any housing plots or apartments they leave behind with. In fact, this would motivate others getting housing since some players might transfer from a high-pop server where getting a house would be next to impossible to a lower-pop server where it's not too hard to get a house.
But static? Yes, some statics may be broken, and while that is certainly unfortunate, but there will always be more raiders and whole statics can be moved to their datacenter of choice without having to worry about things like housing. Furthermore, by the time we get our free transfers in response to (either before or after) the datacenter change-up, there will likely be more statics prepping for the Shadowbringers raid rather than working on Omega.
But, but....something? At least for NA servers, this is only happening because Balmung is not just as bloated as it is, but is filled with so many players that absolutely refuse to leave for one reason or another. What is being done is an attempt to nullify (or at least shrink down) the major excuses players on high-pop servers may have against transferring to lower-pop servers.
As for EU servers, I'm not as sure. The only real theory I have short of increased marketing targeted at the EU is that SE might tighten the limit at which a server becomes classified as "congested" as a means of evening out server populations. This would not only mean that the most populated servers on EU could become listed as "congested", but that more players on NA servers like Balmung would need to transfer before being classified again as "standard", and at that point, players wouldn't have much excuse anymore not to leave.
SERIOUSLY, WHY IS THIS NOT A THING YET? Although I feel like by now, the Aussie playerbase should've banded together and conquered a JP datacenter, or at least a couple of servers on the same datacenter.