MOND is an attempt to explain some observed phenomenon. Whether it is now out or not, I am not sure. But as an attempt to modify Newtonian mechanics, I regard it as a worthwhile step. I was wondering whether the absence of a central mass in a galaxy could explain that phenomenon, but I could not arrive at any conclusion.
The drawback of SR/GR (in my opinion)is that it takes space-time as a physical concept. Take space and time as absolute, and space-time as a mathematical concept to describe the time varying space. The equations of SR/GR will still remain the same.
Similarly, the drawback of QM is that it puts forth the 'instant-duality'. Remove this, and the probability equations of QM, I think, will remain the same.
Same is the case with Newtons laws. The laws are now being used as physical laws. So a change in approach, ie, regard Newtons laws, SR/GR and QM as mathematical laws, and we will get a Physics which is Newtonian, but of course with some modifications. This may eventually lead to the theory of everything.
