I don't think Aeon should go classic until all 4 worlds are playable. It's like you're missing half the server theme and world is a smaller version of an already released server. With only 2 worlds finished, you'll have a team split between watching and fixing 2 worlds, while beginning to develop on another 2.
While in theory, this also means that while on classic, it would take longer than you have been hosted to even get close to releasing the 2 other worlds.
At the moment, you have a classic world, which is completely generic, and a modern server, which, I'm guessing, is basically like every other failed modern server, and smaller as well, seeing as the others only had modern to dedicate themselves to.
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Hopefully this will be the last time that we had to repay for the server XD.
You started working on a server with 4 worlds, which is 4 times more work than a regular server. Take responsibility for making all 4 before you rush through 2 just so you don't have to pay.