Oh boy. I also think that string theories (in their current state) are wrong and possibly a dead end, but I feel uneasy reading this. Besides the harmless typos [0] in the article and his questionable academic affiliation (iSETI [1], which does not pass the straight face test), his referenced publication [2] is published in a questionable journal [3] and begins with an abstract that jumps around from topic to topic while "introducing" new terminology such as "kenos" and tau, a "change in time dilation over a specific height."
(the "straight face test" I wonder to myself, the author claims some endorsement from t'Hooft, maybe some eccentricity can be tolerated...)
Just following the link is enough to tell that indeed, under any reasonable definition of "straight face test" that site would not pass as an academic affiliation. I suspect that the "endorsement" from t'Hoof was more of the "I don't care, send it to these guy" followed by a brisk walk in the opposite direction.
As to the issue at hand, I don't think anyone claims to have a complete string theory to begin with so it's not really an issue of proving anyone wrong.
The sad truth is rather that despite lots of work by many people, string theory and/or supersymmetry, these ideas from a past millennia, are basically the frameworks which produces most somewhat novel ideas today. And its not like people don't try other things, the criticism that string theory is a dead end is at least twenty years old by now, so it's not like there are no incentives to come up with new stuff.
It is true that for a while there was an awful lot of papers with strings or string like words going up on the archive, but looking at the actual production right now, hep-th seems to be into black hole information paradox. So maybe Smolin and Woit making all that fuss did have an effect. Or maybe the graduate students thinking of going into string theory found Luboš blog and decided that accounting was probably more fun anyway.
This is precisely it. The name "String theory" is a bit of a misnomer; it's a framework, not a scientific theory like evolution or special relativity despite the common perception. Sure, it does make predictions (like tiny bits a vibrating energy or "strings" are the most fundamental thing in the universe), but that's a lot like playing solitaire in windows and then proclaiming it a bad OS. Strings are only a tiny piece of a much larger framework.
String theory is a framework in which you build scientific theories. Where relativity or evolution might be programs on a computer, string theory is the OS. Which is why there's so much confusion.
And to say it's a dead end is incorrect; to date there have been some incredibly useful applications in unrelated fields. People are using it for all kinds of things. Even if it's not a theory of everything, it is still helping advance our knowledge and understanding of science.
[0] E.g., "Noble Prize"
[1] http://www.iseti.us/
[2] http://www.scirp.org/Journal/PaperInformation.aspx?PaperID=3...
[3] https://en.wikipedia.org/wiki/Scientific_Research_Publishing