As much as I know about bitcoin and understand how the network operate, I don't think there is anything stopping me from making use of the network for my own benefits, since everything about bitcoin is pointing towards privacy and how we could make profit in our financial economy, it is unprofessional or being uninformed of us to discover someone is leaving bitcoin for other any reason.
No one is leaving Bitcoin, and I don't know why some people are spreading useless rumours like these. It doesn't make sense for one to think that the buying pressure will stay the same at all times, because it doesn't, people buy bitcoins at a higher pace when they know that the bull run is coming close and they can make good profits in a short period, which is the reason why we experience extreme price movements around the halving and after it, and this is the actual reason why we have bull runs because there is a lot of buying pressure on the market, and when that happens, the price of the assets tend to go up.
Similarly, when all that happens, when Bitcoin reaches a new all-time high, people start selling and taking profits, and this could also happen in the same extreme manner because no one would want to lose any of the profits they are getting right now, so this again brings a wave in the market, but this time, it is a negative wave that makes the prices go down. So people need to understand these simple dynamics instead of saying that people are losing interest in Bitcoin when the bull run is gone already, and bear markets tend to be slow and they are supposed to be that way in general.