If this chart doesn't show that we are not, nor are we even close to a bubble, then people just dont understand money.
I laugh, on the inside as to not be extra disrespectful, when people ask me if i think its too late to invest. The mere fact that the questions previous to that are "what is a bitcoin" or "do i have to buy a whole one" should be enough to let you know that we are not in a bubble. Can we be in a bubble when most dont even know what it is?
This chart further illustrates that Bill Gates alone, could purchase all Bitcoins currently in the market. And a company like Apple could purchase all Crypto currencies that exist. With such a small percentage of the total money supply taken up by cryptocurrency, there is still monumental room for growth.
If we are conservative and only assume that Bitcoin may catch Bill Gates in total market cap one day, at that point BTC would be worth upward of $5,000 each. So what is the ceiling for Bitcoin? How high can the market cap grow? Not sure anyone can answer those questions, but one thing should be clear, we are just getting started.