Rich doesn't mean anything if the currency is worthless. Switzerland has value in a consistent, trustable system and educated population. But without a larger military standing behind it, such as other European countries or the US, it's not going to be able to defend against a larger aggressor.

That's why an extremely indebted USA is still very valuable. Because they can park a few aircraft carriers off the coast of whomever they desire (although this may be changing, namely due to China).