Personally I find that very defeatist, and ultimately speculative. We simply don’t know what the future will bring. There have been quite a number of times in the past where such a claim has been made which has subsequently been proven wrong. Maybe it’s right this time, but I don’t see any reason to give up yet.
BIS central bankers’ speeches  11  rates in real terms before the global financial crisis, but have shifted to negative interest rates in real terms after the crisis. The shift is likely to be a response to a lower global interest rate and large capital inflows.