Recently, 85% of the Bitcoin supply has been mined. There is a finite supply of 21 million coins, and this gives it deflationary as opposed to inflationary strengths.
The final Bitcoin will be mined in 2140. We have plenty of time until then.
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Assuming that the worldwide governments won't impose strict measures on the usage of BTC. If this really happens, it will become a popular digital asset in the black market.