Someone did collect 8 portal stones recently on Dwilight. Nothing happened. More realistically, I'd like to see the day when at last the whole urban myth is put to rest by having the adventurer who collects all 8 portal stones activate it, have it do nothing, and have the recoil of the energy that it releases fry the adventurer only and affect absolutely nothing else, thus killing off the adventurer dumb enough to meddle with stuff that he/she cannot understand.
And also because finally that will teach people that portal stones do not do what they think they do anymore. Unless it changes for 5th, but that doesn't seem likely. That seems more like a faith-based religion spread, pen is mightier than the sword thing. You know, the Light's parting words with the whole "Light in our hearts" thing. But of course, I guarantee by the end of 5th, no one will remember that, no one will care that the whole thing about the Light was that it was a manifestation or something or other having to do with the power of human faith. And then BT dies because people in a bigger group start to get dumber as there are more egos flying around, and bad ideas suddenly become more frequent. Funny stuff.