I believe that economists generally think that a small amount of inflation is good for the economy, and that deflation is bad (because it leads to reductions in spending and investment, potentially causing a vicious circle). It's also relatively easy to counteract - just print more. In order for hyperdeflation to occur you'd need a currency where the issuing body didn't believe deflation was bad, or didn't care.

Bitcoin has a hyper deflationary monetary policy hard coded in.

Yup, and as a result, nobody wants to actually treat it as the digital currency that it was originally set out to be.

Anybody who truly thinks Bitcoin could hit $100K value certainly doesn't want to spend them.

It's not really symmetric. It's not hard to imagine a situation where everyone stops believing something (a currency) is not worth anything anymore. But why would somebody believe that nothing except currency is not worth anything?

Not sure what exactly you call hyperdeflation, but something like that has occurred in communist Czechoslovakia in 1953.

https://cs.wikipedia.org/wiki/%C4%8Ceskoslovensk%C3%A1_m%C4%...