>>15313256I hope for a Mega as well, though I don't think that it would benefit GF to release one for him within X/Y.
It isn't the case of Latios/Latias or Plusle/Minun where giving treatment to each at the same time is a must. Gallade and Gardevoir are recognizable on their own - getting the most hype from developing Ralts family kind of requires such changes to be applied in stages.
Like this (unsourced, but still) rumour about Gallade being originally developed at the same stage of franchise as Gardevoir. How it would have worked out for GF if both were to be originally released at the same time? No appetites developed to satisfy, nothing to show in later gens.
At least, this is what the more hopeful part of my mind suggests.