Not true. Bitcoin's market dominance is down to 33.7% as of writing, according to Coinmarketcap.

As for a country's financial stability, I don't think Bitcoin has any significant impacts yet. It did help Japan because the new crypto wealth spurred spending, but that's the only country I'm aware of. Other countries could also be experiencing the same thing, but on a smaller, less observable scale, considering Japan's outright support for crypto.

One thing to consider about Japan's case though, is that with their support comes taxation, and it could be a model other countries will look to emulate.