Treasury bonds were supposed to give some small returns, which should ideally cover the inflation. Then they didn't cover the inflation. Then the returns became 0. And now the bonds have turned negative.
Of course that people look for something better. But, while enthusiasts will say that Bitcoin is the ultimate solution for investment, it's not. If the moment of selling is bad (bear market, crypto winter), Bitcoin investment can be a pain. On very long term Bitcoin is great, had wonderful returns. But only on very long terms. Hence, the best solution is diversifying, Bitcoin being one of the many things invested into. Then, in case of need, one can see what's the best one to sell.
Why are Treasury bonds being compared to bitcoin?
Weren't the bonds OK for sale only at/after certain (long) period of time? My guess would be that, like Treasury Bonds, bitcoin investments work for very long holding times. Like the bonds, if one doesn't know when he will need money, he has to also have other investments. If so, Bitcoin can replace the bonds in the portfolio. But, as I said, it would be good that the portfolio has more than just bonds or bitcoin.