They will not cash out BTC to fiat.
I strongly belief that Satoshi is the name of a government agency of some country.
All the events points in this direction for me.
People will disagree with me, I don't care.
Just my 2 satoshi's
You don't give any arguments or clues
Oh and I doubt that satoshi will become the richest person in the world.. first of all, proof of stake is being figured out by coins like Nxt and going to use something like 1200 times less energy than Bitcoin to run, not to mention being significantly more cost efficient for the same security. That aside.. even if Bitcoin did get to be worth as much as the USD these days, Satoshi would be approximately just as wealthy as Bill Gates, though granted he could actually spend his without needing to cash out his stock and crash it, because everyone else would simply hold onto any BTC he's handed them.
Satoshi will probably never spend his stash
If a BTC is work well into the 6digits he would be the richest person on the earth providing he exists, he is alive and he has access to his BTC
1000 is pretty nice, 1,000,000 is extraordinary