They have to keep kicking the can down the road as far as they can before they just run out of road. And they may just be running out of road. That is when it will get REALLY bad. But they’re pretty creative. They have sort of reached a “damned if you do, damned if you don’t” point. The only question is, which choice gets you “less” damned? And if raising interest rates only affects the government “down the road”, they will increase interest rates.
The Keysyone Keynesians (who see bad times demanding more spending and good times as an opportunity to spend more) are far, far beyond pump priming. These days it’s more like a bunch of spending fiends endlessly engaged in economic masturbation always chasing the high they once got by being but a little spendthrift.