Scenario 1:

That governments could outlaw is a valid concern, as governments have a history of trying to control or ban new technologies that they see as a threat. However, it is also important to remember that Bitcoin is a decentralized currency, which means that it is not controlled by any single entity. This makes it difficult for governments to outlaw Bitcoin completely. Even if governments were to ban Bitcoin, it is likely that it would still exist in the black market. Governments could issue their own digital currencies is also a valid concern, as governments could use their own digital currencies to compete with Bitcoin. However, there are a number of reasons why government-issued digital currencies may not be as successful as Bitcoin. For example, government-issued digital currencies would likely be subject to government control, which could make them less attractive to users who value privacy and freedom.

Scenario 2:

Quantum computing could threaten Bitcoin's security is a valid concern, as quantum computers could theoretically be used to break Bitcoin's encryption. However, it is important to remember that quantum computers are still in their early stages of development. It is not clear when, or even if, quantum computers will be powerful enough to break Bitcoin's encryption. In the meantime, Bitcoin developers are working on ways to make Bitcoin more secure against quantum attacks.