Agreed nominal interest rates will likely drop down again to zero to restimulate the economy, but I doubt that will stick for the next decade, as inflation should creep back in forcing the Fed's hand. However, if you believe that "real interest rates" (ie subtracting inflation) will be zero for a long time, I can concur -- currently they are negative.
Earth is now Japan. Perhaps Mars is the next America.
The banks are a serious drain on the system. They get to extract percentages from the economy year over year, while contributing nothing (except interest obligations).
Then, perhaps, we try to figure out how to engineer solutions that will guarantee certain certain conditions will be met (e.g. Enough food for every person in an area will make it to that area for everyone there to live satisfactorily).
As the dependencies are mapped out and tracked, it will become obvious which tasks are necessary to fulfill the current economic objectives. Then, it's simply a matter of performing the tasks.
The only thing that might change this is something like the opening of the final frontier-- space. But in that case I'm not sure if it would... distances between say Earth and Mars are so vast that any Martian economy would effectively be a separate entity. It might experience rapid growth but I'm not sure if that would translate over here. The Homeworld might still be like Japan-- a zero-bound no-growth economy.
I suppose an AI explosion that wasn't destructive might change things too by creating a lot of new non-corporeal economic entities, but we're well off into sci-fi land here.
Edit: I don't necessarily mean that all forms of "growth" are over. We could still have tremendous growth in knowledge, technological capability, standard of living, and some amount of economic growth. But heavily leveraged inflationary credit economics requires crazy exponential growth in an absolute sense. Without crazy growth it breaks, and the only way to keep it nominally running is to pump money into it to prevent cascading default.
In a sense I think the "pop Austrians" are right that the present system is broken, but they've historically had the failure mode exactly wrong. The failure mode is not hyperinflation-- it's hyperdeflation that's permanently held at bay by money printing ("Japan"). That's because pop Austrians don't get the money multiplier. Almost all money in circulation is credit/debt, not M1. You'd have to print absurd amounts of money and make sure it's distributed more widely than banks to cause a non-localized hyperinflation in a credit economy. (Localized hyperinflation is possible due to bubbles but these usually collapse.)
Of course another way of keeping the illusion alive is to pump up localized credit bubbles repeatedly. These give the illusion to certain sectors or regions that the economy is still growing the way it should... for a while. But then they pop and you need another round of money printing to prevent hyperdeflation. Rinse and repeat. Meanwhile these bubbles distort the price structure of the economy, such as by making housing ridiculous or driving certain commodities crazy.