[quote=@Etcetera]
<Snipped quote by Galaxy Raider>

But for example, there aren't that many human Earths, and most of those are so different, they'd be nothing like our world, or the RP world. And if each progresses at a comparable rate, there will always be advancements.
[/quote]

Is this just a matter of how many universes we as players imagine there are that exist? Because my headcanon is that there are so many universes that I can't even begin to fathom a fraction of how many there are, but there aren't unlimited.