Without fresh money to pay off old holders the price cannot continue to rise.
That would have been a pyramid scheme, which bitcoin is absolutely not.
Bitcoin roughly follows Metcalf's law:
"The value of a .... network is proportional to the square of the number of connected users of the system (n2)."
Therefore, to increase in value 1000fold, you only need to increase the number of users about 31.6 fold.
I doubt that there are 30 mil active bitcoin users, but even if there are, 900mil out of 7bil is a possibility (eventually).
I think that someone projected $2-5mil btc with about 400mil active users.
BS - metcalf's law is about efficiency - and we all know how Bitcoin behaves with more users
Bluebits is right - its a pyramid and unsustainable through itself - there has to be a constant! inflow of money to keep the price on point! - absurd - If everyone HODLs price will decline
There's even that MtGox study which shows that without blatant manipulation price almost always declines. And this is what we are seeing the whole time.
Price declines - pump it up through wash-trading, spoofing, tethers - price declines - repeat
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Soon their resources will get exhausted and BOOM... straight to da moon! 
