Those who demand money want no change in a currency's value by the general price level.
Are you suggesting that Venezuela type inflation is desirable or 2009/2008 crash deflation? BTC provides many tens of percent of each almost every half month.
Everyone know now that it was the crazy credit expansion caused housing bubble and triggered that crash, the crash is inevitable under an inflation based monetary system, since it gave everyone a wrong judgement of real demand thus over invest and over spending
On the other hand, when you have a constantly deflative economy, everyone will expect that and prepare themselves well, the economy will be extremely stable
Negative interest for currency means banks push others to borrow money, however, they borrow money to only buy bonds, resulted in negative interest for the bonds. It seems there is no real meaningful investment that money can go nowadays, due to saturated production and demand
They can push forever, but if there's no demand for credit by the creditworthy, it mean nothing.
Banks do not buy bonds except where forced. They produce loans, in the US almost exclusively mortgages and corporate loans.
All except long term bonds are undervalued at the moment, but there is below average demand, and production is well below historical trends.
As oil continues to collapse, US wage & labor incomes will skyrocket. As the US expansion continues, technology will bubble. The Fed could easily blunder and stop it all if they raise rates while the US deflates in the coming months.
BTC will benefit from none of this. Its fundamental problems are too great.
Producing loan is the same as buying bonds, MBS are also bonds in essential
The real problem is on the demand: When people were really poor, they had lots of demand, but now when they are relatively well established, there is no need for further expansion of economy, they don't need so many houses and cars and useless things, they might want to retire earlier
This is a very natural phenomenon, no matter you use inflation or deflation based monetary system, it will reach that stage sooner or later, monetary policy can only do minor adjustments
In such a long term trend, people will tends to work less and save more, so bitcoin will fit into the picture well, while fiat money is losing its value faster every year, and all the other investment baiscally have no return due to shrinking long term demand