Taking into consideration the hash rate, what are we talking coins in existence that we will see in our average life time? minus a small percentage for lost coins.
It's projected accordingly the mining procedure of minerals like gold. It's now based over an exponential equation that degrades since it's scarcity develops as we go further in time. So; unless a new ''golden'' planet is found (with more reserves) then, the hashrate increase (thus btc mining) may very well imitate the gold mining procedure (minus a small percentage for lost coins.)