If you are referring to nominal interest rates rather than real interest rates, you seem to be contradicting actual fact, no?  In regard to real interest rates, we have been far exceeding a negative territory for well over a year - perhaps two years, no?  In other words, if prices are going up higher than any interest that you can earn on your money, then the real interest rate is negative, there is no need for the fed to announce shit in the negative direction in that regard.

On the other hand, the non-likelihood of the Fed to announce negative interest rates is further bolstered by their actual conduct, no?  From mid-to-late last year, the Fed has been announcing several interest rate hikes that they say that they are going to carry out through 2022.  Yes, they would like to get interest rates into the 3% to 5% arena over a couple of years, in order that they have something to work with when they are wanting to stimulate the economy.. but even their projections hardly get them to 3%, and many of us even question if they are going to be able to carry out their proposed increases (that is why you are suggesting negative, but I just don't think that they are going to go that far in terms of undermining their credibility - even more than it has been undermined in recent times). 

https://www.marketplace.org/2022/03/16/fed-announces-interest-rate-hike-to-combat-inflation/

Yeah, they actually implemented a BIG ASS 0.25% increase in recent weeks, so surely they are whimpy.. but going negative seems a road too far in my own speculation on the topic - even if some other govts - in Europe... have gone into the negative...

To repeat.. we are already effectively at negative, and they are already admitting something like 7.5% inflation when many of us know it is higher than that..  The other day I bought a pack of Ends and pieces bacon, and a couple of years ago, I had been buying 3 lbs for $8 and $7 or less when on sale, so when I went to buy it, and I saw that it was "only" $11, I thought that's not so bad, it's less than a 30% increase.. fair enough... but when I got it home, I noticed that it was only 2.5 pounds rather than 3 pounds.. those fucks.  that's another 17% reduction in quantity..