Many people critize bitcoin for its current volatility and entirely neglect that it can totally change in the long-term.
It appears reasonable to me to expect the system dynamic along a pathway towards (possibly) wide adoption to go through various changes. Yes there are probably phases of hype and there's the influence of block reward halvings but there can also be effects in the long-term that stabilize: the more widespread and integrated in various parts of finance and the economy and actual day to day transactions or people's savings bitcoin were to become the more it would dampen volatility.
Why that? Because unlike purely speculative financial transactions, day to day transactions are very much restricted and influenced by and thus coupled to rather constant human needs, so a lot less volatile than the former.
Now don't get me wrong. I know bitcoin can't directly be used to replace cash because of settlement time and transaction fees. But that's why protocols on top like Lightning exist.
The problem with "stablecoins" is that they reintroduce the single point of failure that sunk Digicash and e-gold, which Bitcoin was specifically designed to eliminate. Holding Tether is a bet that neither Bitfinex nor the Federal Reserve will decide to make their money machine go brrr. I don't know how you feel about the Federal Reserve but I wouldn't trust Bitfinex with my lunch money, much less my savings or my country's foreign reserves.