This episode did raise the idea that People of the Land can become adventurers, though that does remain to be seen. Crusty is implying that she can end her boredom by joining them (and indeed become a hostage), though it isn't clear if she will be raised to immortal status like the players are, or if People of the Land become "Hardcore Mode" Adventurers, without the chance to resurrect.
Perhaps the next episode will shed light on this concept.
If true, I think it increases the chances that the players aren't trapped in this world, but are copies of the player personas and live here permanently. If People of the Land can't convert to Level 1 adventurers (hardcore or not), then...I guess that doesn't mean anything either way.