That Reddit post is very silly. Where's the altcoins? Why is a Bitcoin in common usage with 1% issuance per year still "deflationary"? People don't need loans in the brave new world of 2025? And are we meant to believe governments didn't use M-of-N escrow to protect their stashes?
This is even putting aside the more fundamental issue, that if the rebels have the power of traveling time, they can destroy Bitcoin easily, by double-spending and then reverting via blocks from the future. Much easier/cleaner than nuclear submarine plan

$1m is WAAAAAY more likely than the fucktards saying zero, thats for sure.
Well, "zero" is a long way down; even Zimbabwe Dollars are worth a little as novelty gifts.
That said, I think both are pretty unlikely, assuming no big changes to the code. Very hard to secure the network at that pricepoint, without building many many power plants...