For now, I'd say the government is still Bitcoin's biggest vulnerability, whether through heavier regulation of on and off ramps, or through straight up investing billions in mining to ruin the whole infrastructure.
If bitcoin keeps growing at the same pace, in a few years not even the governments will be a risk for bitcoin
I may agree with this on some points because there are some countries right now that banned cryptocurrency in their own country for some reason which is a bit frustrating because they don't know what Bitcoin can do and how it can help them but... there are more countries who accepted it compare to those who banned it.
Maybe the FUD's that are spreading in the internet and the ability of the whales to manipulate it are its biggest vulnerability. Bitcoin can be easily manipulated by different whales if they want to. They can sell if they want and buy if they want. I'm predicting that in the next years, more and more people will be using not only Bitcoin but other cryptocurrencies and the chances of it to be manipulated will decrease slowly.