Same structure as currently existing Brexit: all the experts think it's a bad experiment to carry out, because even if the effects are unpredictable there's bugger all chance they're not going to be horribly bad.

Even an accurate model is not a predictive model due to all those damn Lorenz Butterflies flapping their wings in India preventing or causing hurricanes in Texas.

She believed in nothing; only her skepticism kept her from being an atheist. -- Jean-Paul Sartre