BTC isn't going anywhere. The price may have big swings, but their will always be a market for it. This is different from equity markets because it spans every country and is independent of them all. There will always be someone willing to buy it at the right price.
Everybody will agree that Bitcoin is different from equity markets. The equity investors will say that their investments are backed by solid cash flows, and that the value of their investments will never go to zero. According to them, that is why equity markets are different from crypto markets. Just because Bitcoin market is different from traditional equity market does not mean that there cannot be a bubble.
Many cryptocurrencies are starting to follow a similar model whereby revenues are shared with token owners, I think there will be a transition in that sense in the future. To suggest that there will always be 'someone' willing to buy at a given price is probably not too far off but let's not forget there are millions of bitcoin, just one person being misinformed is not enough, all in all there needs to be a large amount of people willing to buy at any given price.