Very true, but because of the split between the casual Pokémon and the "hardcore" Pokémon games now, it wouldn't be inherently overshadowing it since it is intended for different audiences.I highly doubt it. As shown by this event, The Pokémon Company prefers to do mainline reveals on their own terms. Plus I doubt that TPCi would want to step on LGP/LGE's toes more than this announcement already did.
You're more than likely correct in their line of thinking though.