(edit: it looks like blockchain.com is fixing Peter's "lost btc" issue from their reply so forget about that in making your estimates 
)
)Is the amount already divulged to the public? This is what I am waiting to know. Is the amount small enough for Peter to simply forget his password on the very wallet in which the Bitcoin is stored or is it huge enough for him to make it a very huge issue internationally? Either way, he looks senile.
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It is safe to say that more and more will be added to the total until the last bitcoin is mined. By the year 2140, btc's total supply in circulation could be more or less 10 million. I can't imagine the effect of that on the price.
The irreversibility of Bitcoin transactions might one day leave this world with an endangered or even extinct Bitcoin.