I don’t know what to say to someone who is ignorant enough to make the post you did and believe it, so I’ll just quote an actual Blizzard representative speaking on behalf of industry experts.
One common suggestion we get is to “just add more layers”, and it’s very important to understand that layers do not add in any way to capacity.
I also just want to reiterate this point though; we’ve raised population caps to accommodate mega-realms to the absolute limit of current technology. I’ve seen a lot of armchair server engineers say things like “just add more hardware”, and I can’t stress it or put it any more plainly, the technology to allow more than we have on realms now does not exist. We’ve added the hardware, we’ve optimized as much as we can optimize, and the current demand on these few realms is just too much.
At present, the best and only way to resolve this issue for the impacted realms, is for people to leave the realm via free transfers. There’s no technology solution to this. There is no hardware solution to this.