By 2140, there will only be 21 million bitcoins, and no more, making it far more rare than gold. I think $1,500 is toward the bottom end of the scale. Particularly with the world's failing fiat currencies, and the coming hyperinflation, bitcoin should easily exceed $100,000 within a decade, and more. This is assuming, of course, that our fragile electronics survive solar flares, EMT phenomena, attacks, etc. Electronics are bitcoin's Achilles heel