String theory. You may have heard of it - many a times on Star Trek no doubt. In physics, quite a few consider it The Theory of Everything. String theory has been hot for a while, almost a decade now. PBS has a popular multi-episode special on it, quite a few best sellers are shilling it.
Yet, what if it turns out to be unprovable New Age-tinged psuedo science, which has no predictative value and fails to explain new phenomenon any better than existing theories?
That's the critical view proffered by anti-string theorists.