Cryptocurrencies will be issued by governments

While more and more money will be turned into cryptocurrency assets ("digital gold"), some countries will see their own currencies become less viable or lose value for other countries in search of safe reserves. This week, the Fed has publicly announced that the issue of cryptocurrencies was a planned track.
The wisest nations (often small) will launch their own cryptocurrencies: digital currencies with a government-controlled issuance and tracking register (and an assumed parity with the country's local currency).
Even if it does not have many of the advantages of digital currencies, and could only be an intermediate state, it will create a short-term demand for this national currency, easy to keep and move, and protected by a state. .

The emergence of a yield curve linked to Bitcoin

Many countries issue debt in dollars, to obtain a better interest rate than if it were issued in their national currency, and to open their debt to a wider range of investors. The prices and volatility of cryptocurrencies will be difficult to take into account, but we can expect to see a cryptocurrency yield curve emerge as governments try to get good rates and reach an international investment community.
This road will not be without pitfalls. History is overflowing with crises caused by a larger-than-expected weakening of the national currency of lenders. This may be the case again, but the consequences will be far more international (and faster) than ever before.

Countries hoard cryptocurrency weapons

When cryptocurrencies become essential infrastructure, replacing much of the current banking systems, states will seek to regain control.
Cryptocurrency weapons can take many forms: mining attacks to reduce the speed of transactions and cause chaos; attempts to attack and discredit individual currencies; back doors to control the mining infrastructure without the owners' knowledge; the secret launch of a clean cryptocurrency with integrated back doors; or simply a processing capacity that can force existing money providers before the maintenance teams can react.

What is clear today is that this digital space becomes a new battlefield, and that fighting will rage for the control and access of distributed value technologies.

@carpinus