What if it drops $1000 in a day? - oh but wait, it can't!, and though I really do get what crumbcake was getting at invoking Pascal's Wager it is a fact only one side has a limit to its movement in a day.

Again, in principle I see your parallel with inventions lying un-built and unused for millennia yet it takes some stretch of the imagination to put Bitcoin in this category.  I see it as closer to the steam train having been built and refined and tested and is now pulling a long mixed consist of goods and savers and speculators.  We may well have hit a bit of a hill that is a struggle for the engine at this stage of its development but there's a lot of momentum behind it and I doubt this will be its nemesis.  But even if it did fail to make the crest of the hill (or the next) its unmaking is by now impossible.  Whether it's Bitcoin or something else the cat is well and truly out of the bag.  There'll be no languishing for millenia for the idea and technology of stateless decentralised money.

And my last query is regarding fear of permabulls.  OK, I get it was at least partially in jest but my question is how can someone who, based on a decent understanding of the concept and its implications, is as convinced as Its About Sharing is be a threat to Bitcoin?  There's a hard core of believers in this technology who would ride the price down to one cent if that's what happened - providing the technology still does as it ought our net worth loss might smart but the hope in the idea would not be smothered.  Holders like that are surely very healthy for Bitcoin.

There is a danger that those looking for an excuse to believe Bitcoin is a get-rich-quick scheme will feed from such positive writings and we probably should be wary of their affect on the market as they alternate between buying without understanding what they're getting into and disillusioned selling when in disbelief they see price can go down too!  But that's not the fault of the permabulls.