Well,   the population of Mexico went from 12 million to 112 million in 112 years,
and there is over 7 billion people in the world, and only 21 million possible BTC.
And many billions of people will die with bitcoins in their wallet, assuming
bitcoin goes mainstream.  I am sure it will happen to 1000s per day.  There are
several factors at work in this, but if bitcoin does go "mainstream" with 100s of
millions or billions of users, you will see millions of bitcoins or decibitcoins or
whatever removed from circulation from death ... every year, or 2, or 5, or whatever.