Bitcoin is already ten years old, the question, if this is a bubble waiting to explode, is already over, people just have to read these recoded time table when people think Bitcoin is dying https://99bitcoins.com/bitcoin-obituaries/.
There will be investors that will do an exit for profit, we have seen that happens so many times, just when Bitcoin is moving forward, investors will sell their coins that they bought at the floor price to make a profit, it's natural and it's been a practice, but that does not mean that they are going out and abandoning Bitcoin, they still have more of it, for another future profit, this is how whales make a profit .