What are the potential threats of Bitcoin?

Not specifically to Bitcoin. I am talking about Bitcoin adoption.

I have been thinking about this. Some say Quantumn Computer, others mention the prohibitation from the goverments.

Personally I think Satoshi Nakamoto is the only threat of his creation.

Why has Satoshi Nakamoto never returned or touched his wallets? I have read through all of his posts and discussion since the dawn of this technology and conclude that this is not a fortunate invention. And clearly he loves his child and understands its potential. So the chance he just suddenly forgets the keys are not very possible. So there must be a reason for his disappearance.

MtGox is a Japansese first biggest crypto trading platform and Nakamoto to me is very much a Japanses name. Since Japan economy has gone downward after the financial attack from the US, Bitcoin might be their waepon against the threat of Dollar in the future.

Not sure when the Japan is going to make a revenge but they are a nation with very high self-esteem, they will never let others put the gun in their head. Probably Satoshi will show up once again to make this happen?

This is like Alumititi and the Satan stuffs, but I just wanna hear your thoughts!