At the financial, business level. Bitcoin may be a bubble. People buy when Bitcoin is low and sell when Bitcoin is high. Bitcoin moves from one person to another. When Bitcoin reaches its peak, the Bitcoin keeper holds the fire, and Bitcoin explodes. So, investing and trading Bitcoin is a very difficult job. Do not risk if you do not get the full knowledge of it.
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Bitcoin is not a bubble because if it is bubble Bitcoin will not come this far of existence.
If we look in broader persecution we will find that bitcoin is bubble of steel and will survive forever. The investment cap is increasing and in the near future it will hold the world market. Blockchain technology is on the back of bitcoin and this technology is prevailing in the world very fast and soon the whole world will use this technology. Now they want to promote bitcoin. So there is no chance of bitcoin blown up.