A deflationary currency regime would raises the bar for both investment and consumption. Investors would be choosier about speculative opportunities because the yield on the risk-free asset would be much, much higher. Consumers would still buy essentials, but they'd be extremely incentivized to hold currency rather than spend it.

Regardless of whether or not a deflationary end-state is better or worse, it seems non-controversial that the transition from our current situation to a deflationary one would be absolutely brutal. We're talking about turning the global economy on it's head.