Can you imagine how many of these BTCs are actually lost forever. Look at this address: http://bitcoinrichlist.com/address/198aMn6ZYAczwrE5NvNTUMyJ5... The last time this address was touched was 2009, and has an even 8,000 coins (back in the day, this only amounted to 320 mined blocks. You could do that in what?... a few hours/half days?[1]) The owner probably ran his system for a few hours, collected 8000 coins, tho…
Let's say bitcoin is to last a century, over time, there will be gradual losses to all kinds of problems, like hardware failures, owner errors, etc that cause lost of wallets, and thus, coins, forever.
There's no way to replace these, so over time, the total number of coins it not only limited, but after the last bitcoin is mined, it must decrease.
This suggests to me that bitcoin is a marvelous experiment that finally proved that such a currency is possible on a wide scale, but as a foundational currency, it has serious flaws, and it sounds like it needs to ultimately be replaced by a Bitcoin 2.0.
However, creating a new Bitcoin that is incompatible with the old would massively destroy value in the old system, so it's an interesting proposition as to how you can 'version' the Bitcoin protocol over time while not causing great upheaval.