It just so happens that with Bitcoin the currency and the speculative investment vehicle are the same thing.
This is a new opinion on money that didn't exist 200 years ago.
For all the things that economists have to say about how terrible deflationary assets are at being a currency, economists fail to admit that gold and silver ran the world for thousands of years.
Using assets as a currency has its pros and cons. But it is absolutely not "completely unworkable", as many modern economists like to claim, as demonstrated by the fact that it DID work for the vast majority of human civilization.
Economics is a science we discard what doesn't work.
Economic predictions about how society would collapse if assets were used as currency is provable false. As proved by the fact that the global economic world chugged along just fine with such a currency.
Only time will tell if the proponents of such action are forward-thinking or delusional.
It's simply a fact that if Bitcoin achieves much wider adoption, the value of a satoshi will necessarily become "large enough." The current exchange rate is already about 66 satoshi to a US cent, and mass-market adoption is currently, to a first approximation, nonexistent.
You don't have to be certain that Bitcoin will achieve the necessary adoption in order to plan for the eventuality. As such, "forward-thinking" is the correct characterization.