Who says string theory doesn't make predictions? It makes *lots* of them. 
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Unfortunately making non unique predictions is perhaps more of a hurdle then making unique wrong ones
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Yes, string theory is drowning in models, which people are now cranking out at an industrial scale. I don't remember anything quite like this before in the history of physics. It seems like something out of a story by Stanislaw Lem.
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Exercise: Compute in plain QFT the number of consistent models with exactly the same field content as the standard model. Do you get a finite number? If not, do you get at least a finite-*dimensional* space of choices? If not, reflect on what's going on.
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