The math needs to take into account
This was your first mistake. At what point in history was BTC's price based on reality or math?
The math needs to take into account
My uncle has cancer and buys cannabis with BTC. For him it is worth a lot.
But he is using BTC as an intermediary. He can just get it 2 minutes before his cannabis puchase and not hold it while he doesn't want to buy weed.
My uncle has cancer and buys cannabis with BTC. For him it is worth a lot. Like if he already spent $100k on chemo, he is only spending $100 on cannabis medicine. On the other hand, he will never use GrubHub and that has zero value to him. He can get cheaper prices by calling the restaurant directly. So, it all depends on who you are. Until cannabis is legal, there is always a use for BTC and it is a lot more than $12. Again, I am not saying it is a buy or sell, just that the math has to be correct.

That's an excellent way to think about it. Let's say there are 30 people in each city with a population over 1 million that have circumstances requiring BTC like your uncle. Let's say there are 1000 such cities for a total population of at least 100 million. That means there are 30,000 people in the world. Some hand-wavy calculations later (0.03% of world GDP), that is about $600 billion annually in BTC transactions. Given that there will only ever be 21 million BTC, that gives a top-line value of $28K.
The problem, of course, is that the numbers I have chosen are extremely favorable to BTC. So what you need is the BTC version of the Drake equation so you can futz with the values and see at what point BTC isn't complete horseshit.
Some of the original blocks of BTC have never been chipped away since initial creation. I find that behavior highly unusual -- when it reached a high valuation, founders like Bill Gates and all the other startups have sold even a small amount. For that reason, I think those blocks are lost forever. Or the founder of bitcoin has bigger balls than Bill Gates or Zuckerburg!
I don't have a position, but I think I would buy happily at $800. That is, bitcoin is worth $10bn in total market cap. Of course, if PayPal or Square drops below that, I might revisit. We are traders of course.
I see a possibility that somehow it collaspes to $0 but I won't bet on it. If I WERE short here at $8k, I would surely take profits at $800. I would love to hear the view of people who think it is worth $0 -- if you had money on it, would you not exit your short at $800?
I will bet he will lose all his wealth quickly.
Can I invest my entire life savings on puts on this guy’s net worth?
Had he sold at the top, he would have made 27 millions.