Just because Satoshi has never moved or sold his bitcoins, so far. That does not mean he will hold onto it forever and will not sell it in the future. Furthermore, we are not certain that he only owned that one wallet. It is possible he owned more bitcoin than we thought and sold it without our knowledge.
If you read my post carefully, you must know I also didn't say Satoshi must hold forever. But I stated "he
may will hold forever".

Sure, it is possible that Satoshi will sell his Bitcoin in the future. And the number can be bigger than we know. However, I trust him, I believe Satoshi won't have the intention to ruin Bitcoin future by selling all their Bitcoin.
When it comes to investing, the first thing we all think about is profit. So, I do not believe that anyone invests in Bitcoin with the intention of holding onto it forever.
It is true, all people who invest in Bitcoin, they must expect for taking profits. Profit is the reason that people want to invest in Bitcoin. Considering this matter, it is quite doubtful that people will hold forever. As far as I know, most people just follow the cycle. They hold 3-4 years, then they take profits and reshape again a new investment.