I´m kinda positive about an incoming bubble, the growth in 2017 has been insane and I don't think BTC can keep this rate of newcomers in the following years.
(I don´t mean BTC will fall hard, but I guess there will be a massive correction, Current Price: $13 000 USD)

But I´m not really sure what will be the reason that will ignite a bubble burst.

Some Common bubble burst reasons from the past are:
Inflation(Ex: Tulip mania)
Debt Financing (2008)

We all know Crypto assets are immune to inflation. But a few days ago, I was checking how  "BTC purchases with Credit card" search raised in google.

But well, after all, a bubble effect burst when no more investors are willing to buy at the elevated price, followed by a massive selloff.

So what do you guys think? What could be the reasons that will cause a BTC Bubble Burst?