Lets be 100% clear. This policy has failed already.
The plan was reduce tax to encourage investment and growth and hope that the bigger economy will more than offset the lower tax rates. This would take several years to come through. (This bit is the gamble).
What has happened is the £ has crashed as a result of lack of market confidence. The markets think that not enough tax will be raised and therefore government finances will deteriorate.
The key bit is this - the reduction in the value of the £ means all our imports cost more, including oil and gas (wile we are a net producer the economic benefit is owned by private companies and they sell to all of us based on the $ value). So the measure is inflationary. Liz truss was told this during her campaign and rejected the idea. She has been proven wrong already.
And going back to the initial gamble - there is practically zero chance that any growth generated will offset the now higher costs that we as a nation will face. Prosperity will be hit by the inflationary pressure and growth will be negatively impacted. It was a gamble assuming markets remained steady - given the adverse movements it looks like a slam dunk fail.
Let's also be clear that this gamble wasn't like betting on City to beat United on the weekend.
It wasn't even like tossing a coin.
The reason Rishi Sunak and others are looking so smart right now for predicting exactly what would happen is because loads of people knew this would happen when you increased borrowing and cut tax revenue.