Governments can't control it, yet El Salvador decided to make Bitcoin legal tender. Ironic, isn't it? Imagine how things would be if institutional investment firms and governments amass a large portion of the circulating supply. BTC will be highly unequal and less-decentralized. To be able to buy/sell BTC, you'd be forced to use a centralized exchange or service as the supply lies in the hands of such entities. So making Bitcoin legal tender would have little or no relevance at all.
Besides, the masses consider BTC as the "next digital Gold". Not as an alternative currency for payments. Even the LN has failed on making BTC practical for daily payments. At least, mainstream adoption for BTC is on the rise. Legal tender or not, it will be here to stay for a long time.
There is no irony because El Salvador does not have their own national currency. They used USD as their main currency before the economy before adopting bitcoin, and in the world, there are not many countries that do not have their own currency like them.
Yes, using bitcoin as currency will create huge inequality as people/countries holding more bitcoins will become richer while people/countries holding less bitcoins will become poorer. This happened during the gold standard era and no one wants to go back to that era, especially the poor because they hardly own any bitcoins.
We need to admit that an asset with limited supply, high volatility and decentralization cannot be a currency and that does not bring much benefit to the modern economy we live in.