In the long run, we will reach a situation where there's no economic growth, no population growth, savings and investment will be about constant. Worst-case scenerio: the world is dead. Best-case situation: we live comfortably well off, perhaps even mild luxuriously, with plenty of leisure time and ways to exploit it. Renewables (solar, wind power) or virtually unlimited energy sources (fusion power) provide sufficient energy. Population and economic levels are approximately constant. (There may be some growth, with new inventions improving our lifestyle gradually.)
In that context, money supply should be about constant. Government deficit spending should be about zero, along with zero growth. Three major views of money and economics converge to the same point.
I wouldn't know, of course, but I wouldn't be surprised if this time began late this century, around the time the the Bitcoin supply is designed to remain constant forever.