But the bubble has supposedly popped many times, keep in mind Bitcoin has had crashes far greater than just 50% before (closer to 90% has happened multiple times, see https://en.wikipedia.org/wiki/History_of_bitcoin#Prices_and_...). So if this is 'the' bubble pop, rather than just another large crash, will remain an open question for quite some time.

What seems apparent to me is that all the Bitcoin miners that have invested heavily in mining equipment want to see it continue to grow. The market may only slow down once miners no longer see a return on further investment (when the increasing price of electricity + mining equipment, combined with the steady rise of hashing difficulty, no longer makes it profitable), or when the transaction fees and transaction speed become too much of an issue. In other words, it's the technical limitations that seem most likely to stop the rise of Bitcoin (in my opinion).