I'm not sure what this quote is meant to illustrate. The structure of the Electron is now understood in QM (it is structure-less, an elementary particle), the luminiferous aether is disproven, and gravity is understood as equivalent to acceleration, essentially through E=mc2, instead of being carried by particle or wave (though it can cause waves, as recently detected). On the other hand, other fields, such as the electrical field, are shown to reduce to particles flying around (photons, for the electric field), so if the quote was meant to say that electrical charge could replace a graviton, that has proven wrong.