Not exactly. Satoshi could, in theory, have mortgaged his Bitcoins and might have taken cash for it. In such a case those bitcoins would have never made it into the open market and would still be held with the private or institutionalized lender that would have given out cash for those coins.
This could have been done without even moving the coins outside of their original wallets, just sell the private key, hard drive etc etc IMHO It'd would be quite disastrous if all those original coins are actually held by someone who's not the real Satoshi. Such an individual would be more interested in cashing out their coins at a future high point of the market - something which the real Satoshi may not choose to do so. Idealistically.
That is not going to happen. No financial institution is going to accept a mortgage over private keys. Not even for Satoshi. If two people (the borrower and the financial institution) have the private keys, any one of them can move or access the coins.
Are you serious? This is a billion dollar industry and its in a nascent stage. Comparable to the 1800's for the automobile industry.
Sure, not every institutionalized bank or lender would want to take the risk, but you only need one group to agree to do this and you're all set.
If you have connections and if those connections are risk takers then this is - literally a billion-dollar gamble that has a huge payoff.