Alternate economic strategies have been thoroughly researched and proposed
One example is the Zero Caron Britain report produced by the Centre for Alternative Energy several years ago. Still very viable, but of course entrenched self-interest from those benefitting from the status quo make it difficult to gain traction.
And yes, they do reject nuclear as it is a massive drain on society for decades (tens of decades?) and never delivers the bountiful cheap energy it has always promised is just a few years away.
Back in the 1950s when we needed happy shoppers to drive the economy and deliver us all from grinding poverty and the mess left after the 2nd World War the Marshall plan was a good idea.
Particularly as modern agricultural practices and complete ignorance of the danger of carbon emissions meant there seemed to be no downside.
Now we know better. GDP has long been maligned as a v misleading tool for measuring 'progress' a good war does wonders for the GDP. Bobby Kennedy bemoaned its limitations as far back as 1968:
"And this is one of the great tasks of leadership for us, as individuals and citizens this year. But even if we act to erase material poverty, there is another greater task, it is to confront the poverty of satisfaction - purpose and dignity - that afflicts us all. Too much and for too long, we seemed to have surrendered personal excellence and community values in the mere accumulation of material things. Our Gross National Product, now, is over $800 billion dollars a year, but that Gross National Product - if we judge the United States of America by that - that Gross National Product counts air pollution and cigarette advertising, and ambulances to clear our highways of carnage. It counts special locks for our doors and the jails for the people who break them. It counts the destruction of the redwood and the loss of our natural wonder in chaotic sprawl. It counts napalm and counts nuclear warheads and armored cars for the police to fight the riots in our cities. It counts Whitman's rifle and Speck's knife, and the television programs which glorify violence in order to sell toys to our children. Yet the gross national product does not allow for the health of our children, the quality of their education or the joy of their play. It does not include the beauty of our poetry or the strength of our marriages, the intelligence of our public debate or the integrity of our public officials. It measures neither our wit nor our courage, neither our wisdom nor our learning, neither our compassion nor our devotion to our country, it measures everything in short, except that which makes life worthwhile. And it can tell us everything about America except why we are proud that we are Americans."
So yes, the need for a new system is LONG overdue. Crashes and a general deterioration in living standards for us in the developed world are the new normal. Periods of 'growth' as it used to be understood will become fewer and further between and are not the system returning to normal, but unsustainable attempts by those in power to make us believe that is so.