I find it funny that people think that BTC is not real currency. "Ohhh, it is 1s and 0s, so it is not real".
But yeah, your little dollar bill is real, right? It is not only ink on a piece of paper that the government can issue and destroy at their will, right?

Can BTC crash and become nothing? Sure! It can happen if people stop using it.
But the same applies to any currency in the world. If people choose to stop using Dollar, Euro, Yen, etc, then the same thing will happen.