part of the beauty of Einstein's work was the simplicity of his ideas. he took us to a more complete and more accurate view of reality by imagining, to begin with, that things as simple as relative rates of motion and a fixed speed of light have a fundamental importance not just to physical observables but also to the *perception* of physical parameters (like time). so an Einstein-like revolution wouldn't have to be highly complicated. it could just refresh the qualitative understanding of physical concepts. a revolutionary might validate a super-dimensional universe by opening the door to testing such super-dimensionality, or they might instead find a perspective that makes super-dimensionality an unnecessarily complicating idea. or "dark matter" less spooky, or string theory connected to other theories.
the main problem (and i would say fraud) with theories like super-dimensionality, dark matter, string theory and the like is that they aren't obviously testable. they are bunk until they can be shown as successful (or not) at explaining some physical observables. relativity, while certainly 'out there' compared to the more conventional theories of Einstein's time, made testable predictions. the success of relativity depended completely on that fact. modern theories that ignore that basic and essential standard can't succeed.
Loeb thinks "another Einstein" is needed to jumpstart modern physics. what is truly needed, i think, is scientists who respect elementary scientific process and who are willing to disrespect all the bunk while searching for better perspectives. anyone can do that, and if enough of us realize that and act on it, some people will succeed at it.