Who thinks this way? I believe that these remarks really represent you're own peculiar point of view and provide no real basis to doubt string theory. I certainly feel no need to defend string theory against them and continue to have no doubt that the ideas in Nicolai's work quite obviously have their origins in string theory as it is understood by most string theorists, a group to which you quite clearly do not belong.Well what I was saying is that there are two aspects in the defense of string theory: "broad string theory", which includes things as AdS/QCD and Duff Brane theory, and "unique string theory", which is the D=10 quantum stuff. Some people can defend an aspect without defending the other, some people can defend both.
Now, if AdS/QCD were related to "unique string theory", I would think it vindicates, somehow, old Veneziano et family approaches but it diminishes the interpretation of strings as fundamental blocks at Planck scale. If on the contrary AdS/QCD is about "broad string theory", it does not add any bit about quantum gravity.
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