I think you have some interesting ideas, but I offer here some contradictory evidence for you consider:

1. From the beginning, Bill Gates has been anti-open source software. He even wrote a letter to developers lamenting the sharing of code in his early years. To my knowledge, all cryptocurrencies are based on open source software and protocols, therefore, I doubt Mr. Gates is Mr. Satoshi.
2. At last count, there were more than 1500 cryptocurrencies in circulation or in the planning stages. It may be possible for a one world government to co-opt them all before they can disintermediate the dollar and the Euro, but I think the chances of that happening are remote. There are enough currencies available that it would be difficult to choose which one to use for world government.

While learning to trade crypto, I've been considering the trade implications of say, Litecoin should it reach mainstream adoption. Gone is the currency manipulation between the Yuan and the Dollar. Without an exchange barrier to trade, trade becomes easier, but calculating incomes and real income becomes easy for people who are not economists.

At the very least, there will 5-10 currencies accepted worldwide and I have reason to doubt that the banks will try to get them all under control. Even if they tried, I don't think it would be possible for them to do it. For it is the people that give money value and power. All power resides in the people.

If the people find that government has co-opted a cryptocurrency and find that they do not benefit from that arrangement, with enough ingenuity and persistence, they will find a way out.

The probability of something getting started is inversely proportionate to the square of the number of people involved. This is why I don't think a one world government is possible as a result of Bitcoin or any other coin. These coins are not designed to facilitate one world government.

In fact, many if not all of these coins were designed by anarchists who don't believe in leaders, much less a one world government. It would seem then, that they have considered the possibility of co-option by government and have likely designed government out of their coin governance plans.

Considering the above, I guess you could say that I'm an optimist.