People who predict a price for bitcoin are putting a cap on it. They're just saying bitcoin will reach a certain amount by a certain time. They are not saying the maximum amount for the bitcoin price is what they predict. It's normal for people to predict the bitcoin price.

Nobody can say the maximum price bitcoin can get to because we can never know. As long as bitcoin is still alive, it can get to any price. What we can do is predict what price it will reach at a certain time. People don't think $1 million is the maximum; they're only not thinking about what comes beyond it because getting to that is a lot.
There was a time when people did not think about bitcoin beyond $ 100k because it was so far away from that point.