If a particularly powerful solar flare knocks out the internet for a couple of weeks my real estate investment will still keep me housed. Your bitcoin asset will do... what? Even USD (at least in physical form) is more useful in a crisis. I can put it in my pocket and trade it with the guy down the street for food/water (under the assumption that the government won't collapse). The amount of high-tech, fragile infrastructure bitcoin needs to function correctly is astounding. The entire idea of bitcoin being superior to traditional currencies depends on the idea that nothing really bad will ever happen again.
> If a particularly powerful solar flare knocks out the internet for a couple of weeks
You'd have more serious problems than cash liquidity.
> USD (at least in physical form) is more useful
Which is what, like a low single digit percent of USD? Most people I know don't even have a couple days' worth of paper USD.
> fragile infrastructure
Internet isn't fragile at all. It's extremely robust, especially for relatively low-bandwidth applications like bitcoin. It's certainly more robust than the card payment networks most people rely on.
> bitcoin being superior to traditional currencies depends on the idea that nothing really bad will ever happen again
Anything "really bad" enough to nuke bitcoin will probably also kill you and almost certainly tank the value of USD paper.
It's still a net gain for society though - introducing good hard money is extremely positive-sum.