You're simply running different numbers. You're basing this on population numbers where as the Devs (And thus my self since I'm playing devil's advocate for their defence ) are running the numbers based on how many Empty plots there are per server. Of all of the servers only the legacy servers and around half a dozen non-legacy servers are completely out of housing plots. Conversely the majority of the servers either have a balance of free to purchased plots or a surplus of empty ones with no one to buy them.
So again, this comes back to server stress not players in and of themselves. When the majority of the playerbase is made up of the minority of the servers then the simplest solution is we need about 5-10% of plot less players to jump to a different server. The Prefered solution seems to be making new plots and kicking people who worked just as hard as you out because you're selfish and impatient. As for what the best solution is, if they knew that they'd have done it already thus why they are still working on it.
Fun fact, nothing, I repeat, NOTHING, that a FC house is needed for or is required for any level of game completion and is 100% optional, vanity content.
"Oh what about the Air Ships Kaiser, there are company Airships in 3.0, how do we make them with no FC Plot?!?! <Whine,bitch, moan, cry, gripe>"
Irrelevant, it'll be 3.1 at the earliest that airship construction is implemented and even later before airship content is developed. So there will still be no gameplay based content in the immediate future that needs an FC house.
tl:rd
The devs are looking at purchased plot numbers not player population, they are working on a solution, FC plots aren't required for any content that will lock people out of gameplay and probably never will be. now stop acting like spoiled and entitled brats, shut your whining up, and wait for the devs to fix it. They could after all just decide "Ya know, this was a bad idea after all, lets cancel all further housing development and use the resources on something else" then who would win? And that is in their power so be glad they aren't as petty as some of you act.