Few serious notes. Currently bitcoin is limited so it will never get to 21 million coins but of course there are infinite fractions of coins. Unlike fiat where they removed half cents and are thinking about getting rid of pennies bitocoins inflation will slow down, stop, and even reverse as coins are lost.

Another important point is that just because bitcoin is limited to 21 million coins now doesn't mean it will always be that way. It would take quite a bit of doing but the code could be changed to some other value. There have even been articles on how it could be done as a soft fork instead of a hard fork of bitcoin.