Well.
As somebody that is playing on Spriggan for a long time too, I can tell you that most of the active players are either in Solution Nine, or in their (FC) houses. They might have went away after they finished the MSQ too. My FC was pretty active when the expansion dropped, and they didn't come back since finishing the raid tier. They will most likely come back on 7.1. As things stand now, most players on Chaos are raiding on Light or joining pfs on Light because that is where most pfs are. It definitely wasn't as bad when the expansion dropped, but the whole DC has been a complete desert since last month.
That being said, I believe this is all due to the decision to split Chaos into Light and Chaos back in Shadowbringers. The active population didn't particularly justify that split either at the time, but whatever. Case is, interDC groups are the norm. If you close one off, you're going to break most raiding groups whos active at the moment, and that is going to make a lot of people quit entirely if they can't play with their friends.
I'm probably asking for a lot here, but if we could have a proper server merge with all the European worlds accessible from one DC, this would solve the issue in one strike and we wouldn't have to worry about when cross DC /tell and groups being implemented. That way, we get no house demolished, we get everyone accessible from a few clicks and everyones happy.
Moreover, we already witnessed server-bound pfs dying at the end of Heavensward in favour of DC-bound groups. Now, the same thing is happening on a DC level, and frankly, the neat thing is that it can be fixed without removing servers.