"I imagine a scenario where we learn that those who weren't saved weren't 'real'."
That sounds good, so, with no evidence whatsoever, I'm going to imagine a scenario in which all you Rapture Retards aren't real.
"What I mean is that I view the world as a kind of tester/simulator."
Aren't you folks supposedly big on a literal reading of the Bible? Nothing about the earth being a "tester/simulator" in the Bible, twinkie.
"The elect are put into the simulator to develop and test their souls."
By an omniscient deity who already knows the heart of every man?
"Those around us that are not saved are part of the simulation."
What of those elect who do not develop properly or who do not pass there "soul" tests?
"They seem real to us, but in the end they turn out not to be."
I am not one of those deluded into thinking that I am one of the "elect," however, I seem very real. No, really, all my friends agree that I AM real.
"Nothing in scripture supports this,"
That much is certain.
"but this is how I took the verses about the potter creating vessels for ignoble purposes and some for noble purposes."
Yes, but you haven't taken into consideration that you are a deluded bonehead.