If all governments support cryptocurrencies, bitcoin will grow wildly. This kind of exhibition will lead to the disappearance of the stock market. In the future, all companies will issue their own coins instead of entering the stock market.
There's no point in discussing "what would have happened if..." cause this won't be, it's utopia! Not all countries will legalize BTC, but we don't need it. We need China, India, USA, and Europe to do this cause they're the strongest world economics.