I think, to answer your question in present terms, super positive price for 1 BTC would be around 5 Million USD.
This number is only based on USA.
If the world began using BTC as its only means of currency exchange, then 15.5 Million USD per 1 BTC.
IMO
Sounds nuts but it's actually way more accurate that winkleloss bros saying it could get to $50,000. I mean Coinbase CEO is now saying it could become the reserve currency. In the eye of a currency collapse storm which we are heading toward its not that crazy to think people would reach for the one currency that actually worked.
When the Wink Bros say $50k USD, I think they are thinking just a 1 Billion Market Cap.
That is the number as a payment processor, like VISA, Mastercard, etc (combined).
If "Dollar Collapses" or the World uses BTC as its collective global currency system/supply, then I think 5 to 15 Million USD.
I could be very wrong, I'm no economist nor mathematician.
I'm just thinking dooms day scenario for world, but most positive outcome for BTC.
EDIT:
CORRECTIONS: The 1 Billion Market Cap, that I stated above, should really be around 700 Billion Market Cap.CORRECTIONS: All Credit Card Companies (USA) combined in 2012 was 7+ Trillion Market Cap.CLARIFICATION: When I calculated my "5 to 15 Million USD" above, I was using 2014 USA Wealth to 2014 World Wealth Stats.CLARIFICATION: 2014 World Wealth = 264 Trillion USD divided by 21,000,000 BTC = 12.5 Million USDThis is a common pitfall in the bitcoin community. You can't replace total wealth all with bitcoins. There isn't a dollar for every single "dollar of networth" in existence.
For example, even if bitcoins replace all fiat currencies, bitcoin cannot replace your house. Or your table. Or your car. All of those are included in wealth.
So there is no way bitcoins will be worth as much as the total wealth of the world, it's just not possible.
I would say the MOST optimistic scenario, bitcoin could potentially be worth 1 million dollars each, present value. But I would say the chances of that happening are very, very, very, very low. The $40,000 winklevoss estimate is comparatively a lot more realistic.