The danger is if people are buying bitcoins in the expectation that the price will go up, and the resulting increased demand is what is driving the price up. That is the definition of a BUBBLE, and as we all know, bubbles burst.
what you say is pure speculation.
how do you know when to define it as a bubble?
we may talk about a bubble when BTC/USD is at current value, at 100$, at 10,000$, etc.
currently, there is no technical evidence for a bubble