If Satoshi for some reasons withdraw all of those 1.1M Bitcoins, and decided to sell, it will create a domino effect towards the whole crypto space, and in a negative way.

This event might make some of those Bitcoin holders out there to panic sell their holdings just because they see the creator selling those Bitcoins. I believe this will not happen anymore, but if Satoshi really wanted to sell those Bitcoins, he/she might've done it already... or he/she is just waiting for the perfect opportunity. On the flip side, even though Satoshi will sell those Bitcoin, I believe that it will thrive still. I mean there will still be buyers anyway, and large institutions are even accumulating it. I believe that Bitcoin will still go up in price as long as there are demand.

Overall, this event IF IT HAPPENS, will just create a short term negative effect towards not only Bitcoin, but the whole crypto space.