[quote=@Host]
<Snipped quote by Balance>

Pretty much. And the fact that dimensional travel scientifically takes abhorrently specific conditions means that it probably won't be discovered.
[/quote]

Yeah. That in itself would be a big deterrent, which is why I mentioned "many long aeons". Probability can be unreliable, but on average, things actually manage to work out the way it says they will. Many long aeons means many many universes means many many chances to discover dimensional travel.