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 One #Bitcoin is always worth the same, namely 1/21,000,000. It is the fiat currency that fluctuates and loses value over time, because new notes are printed daily. 

Phew 
 That's partly true. What is the estimated amount of "lost" and unrecoverable BTC due to sat-dust on wallet purge, or from lost keys, or even simple abandonment? Let's call this value LOST_BTC.

I think 1BTC = (2.1*10^7 - LOST_BTC). Thus 1BTC is worth more than 1/21,000,000.