It is annoying to constantly answer the question what the total amount of Ether(eum) will be. There will be no final amount.
I created this thread to show how many Ether will be created in the next 100 years. Year 0 = 2015.
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As you see, there are created exactly 15,626,576 Ether each year (it is 26% of the originally created 60,102,216 Ether).
Technically incorrect, PoW difficulty increases exponentially after 1 year, causing the block interval to increase and block creation to essentially cease. Before then a hard fork is to be issued, likely to PoS / Casper. No details are set in stone, however a 1500 coin staking minimum has been suggested. The PoS monetary policy is TBD, could be tx fees + inflation or processing fees only, subject to security considerations.
https://www.reddit.com/r/ethereum/comments/410ifx/so_is_the_number_of_ethereum_coins_going_to_be/cyz08wo