Well, one answer is that there apparently IS an aether. But this is not your grandfather's aether. Nevertheless, we are told that ~70% of the mass/energy of the universe is dark energy, which is a scalar field permeating all of space. This sounds kind of aether-ish. Then we have independent Nobel prize winners like Frank Wilczek1 and Robert B. Laughlin2 who, as I understand it, view the universe we live in sort of like a superconductor, out of which mass and energy condense. And of course, there's the background Higgs field hypothesized to be everywhere so as to give mass to things with mass. But as I said, these are not the old aether, which was the luminiferous aether -- hypothesized so that light could propagate through it. These new "aethers" are invoked for different reasons.
Originally Posted by Marakai
1 The Lightness of Being, Mass, ether, and the unification of forces 
2 A Different Universe: Reinventing Physics from the Bottom Down 
Everyone is entitled to his own opinion, but not his own facts.