Many experts have said before that Bitcoin is a bubble that will soon burst and the price of Bitcoin will go down.
These so-called experts that you are saying are the ones who are pessimistic with regards to Bitcoin.
Tulips is very different from Bitcoin. Bitcoin has gone thru many bubbles too back in the days but if you will see the long chart of it, it is going into one trend only and it is upwards. We might see Bitcoin goes down yes since it is normal but in the long run, it will just go higher and higher.