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I am into btc but I have worries if what will the world will be if it's fully decentralized or like you said, the global unit of account will only be btc. I couldn't ask for more but btc having a volatile nature is already fine for me and we still have a stable coins anyway if we want some stability.
Having stable coins is not stability, imo. Their value is pegged to the value of a fiat currency and, especially in times like these, one can't certainly expect a sustainable purchasing power of fiat currencies. And, in fact, unlike Bitcoin, stable coins can only lose their real value with time. So, if by "stability" we mean constant losing of real value, then stable coins are stable in that sense. But who wants that stability?