Merge two of the lowest pop "empty" servers, then, and use the freed resources for a new server. Yes, it takes money, but at some point that's got to stop being an excuse. SE's job is to invest money into the game to make a profit. The situation on Balmung right now is not okay, people are losing faith in SE, people are getting so fed up they are quitting or considering it because they can't stand being on Balmung anymore but don't want to be parted from their friends and the largest RP community. We've put up with the long queues and the server crashes, the ridiculous lack of housing and contradicting info about what can or can't be done in regards to people "flipping" houses, the lack of fresh faces in the community and the inability to play on the same server as friends who are just picking up the game, and now the economy is absolutely tanking.
People are either saving ridiculous amounts of gil to buy houses at multiple times their actual cost from other players, or they already have their house or have foregone that madness and have instead already bought all the things they want and need. There are no new players and no new characters being made. There's jump potions available atm so even classes and characters people haven't gotten around to leveling yet don't need low-level gear and food etc. when they can just get boosted to a high level instead of grinding out levels. No one is buying anything. Prices are super low and they drop drastically every day, sometimes every hour, sometimes in minutes. Undercutting is out of hand. Things just aren't selling. Making gil is nearly impossible, yet if you want a house, you need to save up a few dozen mil for a small plot and risk getting in trouble for buying it from another player. If you need to clear out your inventory, you'll have better luck trashing what you have or vendoring it, because otherwise your retainers will be sitting full of things listed on the marketboard for weeks. It's getting out of hand and it's long past time SE does something about it when no other fix has been more than a band-aid at best.
We have seen how Mateus's population blew up so quickly when it was named the unofficial, secondary RP server. There's not a chance that at least the same level of interest wouldn't be generated by an official RP server.
