The Blue Fairy knew what Rumpelstiltskin was doing. We saw the flip version of the War Council meeting in ‘The Stranger’ but wouldn’t have been interesting, if it had gone likes this instead:
Blue Fairy: You know, some thousands of years before any of you were born, Rumpelstiltskin became obsessed with creating this curse that will bring everyone to the Real World, so he can find his son, Baelfire.
BF: Because I gave Baelfire this magic bean that created this big green vortex of doom that transported him across time and space to a world without magic.
BF: Bu I figured after some decades had passed, the probability that Rumpelstiltskin would actually succeed in creating such a curse, was very unlikely.
Charming: So why didn’t you tell us about this earlier?
The Blue Fairy: Well, nobody asked, but I thought I would say something now, in case it might be the same evil Dark Curse.