This is the answer ^1. As the bitcoin economy evolves, people will make use of services which help guarantee returns are possible. Such services become augmented on top of bitcoin. I would imagine that in a matured bitcoin market most transactions will not be anonymous, because it makes sense in most transactions for both parties to be known and accountable. However, entering into these non-anonymous transactions is voluntary.
In the same way, a mature bitcoin economy would not have every participant storing his/her coins on their personal computer. Rather, companies will exist to protect money and individuals can decide to utilize such services.
There is a market demand for security and safety in trade. Entrepreneurs will figure out the best way to deliver, building services upon Bitcoin's fundamentals.