Yes, anything that requires government action is very hard in practice. But rhetorically, we discount that when talking about whether some government action would be a good idea or not.
Who's "we"? I think it's completely reasonable to consider how practical something of this magnitude is. You're not passing a single law; you're talking about fundamentally changing the entire nature of the (US? world?) economy in ways that I find difficult to even comprehend. I'm not even sure any amount of government action would be sufficient to bring it about.
Sorry, I must have given the wrong impression. To be clearer, I was hinting at either more government spending, universal basic income, or "helicopter money," as alternatives to attempting to stimulate the economy by encouraging more loans. These have precedents and it's not particularly difficult for a government to be efficient at giving people money.