2021: One dev are about 5 BTC now (including benefits), so it's nice to see costs will come down in the future.
Not really. $300k+ still isn't normal outside of the US (or even in the US outside of certain cities / companies). And that's the case even if you take benefits into account.
99.9% of Software professionals probably don't make $300k
What's your rationale to suggest that inflation will double the price of everything in the next 4 years?