The idea was never to keep the economy afloat- it was to build a bridge to prevent being exposed to the rough waters.
Their moves so far might float us though a short recession, but it's not clear at this point if it will be enough.
I get mainstream econ looks down on it, but given the fact sticking strictly to Keynesian thinking has led to businesses being incentivized to create faulty product (Boeing), committing outright fraud (Wells Fargo), causing widespread destruction through abdication of due diligence (PG&E), exploiting addictive chemicals for business growth and engaging in unscrupulous price gouging (Shkreli, Pharma st al), and our current economic powerhouses are increasingly centered around consumer finacialization (every bloody major tech company), and for God's sake, Juicero happened; I'm honestly curious if the Austrian's might not be on to something.
Maybe the market does need to crash down to the basics. I just don't know if there is really a way for that to happen at this point given how capital is so damn centralized right now.
The problem is I just don't think it would be politically possible in the slightest to actually just sit back and hands off; and even if someone were that bold, they'd basically have just proven that there is no reason for them to exist as an institution anyway.
Which I don't necessarily think is an inconceivable state of affairs, but I don't see the economists of the world throwing in the towel and admitting that willingly.
Big moves when there is big news (like a global pandemic say) are normal events.
The thing I find concerning is why the FED are "intervening". Dumping cash made sense during a cash shortage. But when there are actual, real, concerns about the future (coronavirus), price falls are perfectly correct. They don't need "fixing". Happy to be corrected if anyone knows?