If it stayed alive long enough and the dollar still existed then it's borderline inevitable that there'll be a million dollar coin one day. At today's buying power? It would've had to have conquered the world.
In a thousand years there might be a one million dollar note if inflation keeps going up. At that point I'd guarantee there will be at the least a one million dollar bitcoin, if bitcoin still exists by then. In a thousand years all bitcoins will have been mined, and only the network fees will support the miners, so the miners won't be able to dump the price down. Think about prices of everyday goods from 30 or 40 years ago, and what you pay for those same goods now. In a thousand years those goods will have astronomical prices by today's standards.