People have been saying this ever since Bitcoin came into existence. The moment it crossed 500$, people start speculating that the bubble would burst and it wasn't until it reached 20k$ that the bubble actually bursted. The price will stay in this range for a couple of years now and we might see it cross 10000 dollars by the year end. Apart from that there is NO BUBBLE and it WON'T BURST! So relax.
Exactly people worry too much about the price of bitcoin, we have seen this same behavior several times already in the history of bitcoin, we saw this behavior not long ago the first time bitcoin surpassed 1200 and then it crashed, it took a few years to reach that price again and then the price skyrocketed in a way no one imagined and the same is going to happen again.