Dejan Corovic
As above, so bellow
There's no way we will agree on this point, but I would simply observe that the physical theories that you have recourse to have boundary conditions defined by the physical dimension that we find ourselves in. If other dimensions do exist -- and I think the door is still open -- they would likely be subject to totally different physical laws. Therefore we still need to keep all possibilities in mind -- if you prefer to limit your options that is your choice, of course.
There is no such a thing as a "totally new laws of Physics". Physics continues in a succession of steps, like Russian dolls. General Relativity contains Newton's gravity laws. And both these theories exclude extra dimensions. So the next new classical theory of gravity will have to exclude extra dimension.