Either everybody waits until the bubble begins in anticipation of one -> bubble starts too late
Either way it won't happen when it's expected and you should have bought before it actually happens.
Or maybe, just maybe, the hundreds of thousands of individual actors with different priorities, beliefs, and understanding will somehow manage to behave differently from each other and the two camps cancel each other out, starting the bubble right on time.
If all the involved actors would cancel each other, the prise would remain the same. But I get what you are saying, but you have to admit that it sounds quite stupid...
100 000 people equally spread 50/50, to buy exactly on the moment some chart predicted it would.
I was trying to take your polar view and break it up to show you the actual continuum. Don't just stare at the middle. There are millions of shades of grey between black and white.