While i don't like deflation (especially on long run) and big inflation, few things such as 21 million coin supply is one of
Principles of Bitcoin that shouldn't be changed and will be disagreed by majority of Bitcoin community.
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although if it becomes unprofitable to mine it'll be the node owners doing the mining which wouldn't be a bad thing (each node miner with a few chips to mine with like the gekkos side hack makes - id be into that).
It won't happen as bitcoin mining difficulty simply decreased and miners with most efficient ASIC and low operational cost still can mining with profit.
It is now a principle, but it was not until 2014. The finite monetary supply was added through bip42 :
.