Not that it’ll ever make enough of a dent in their profits to make any difference anyway, but this could also swing the other way. If nobody buys their games because they’re bad, the impression those in control could get is that Pokemon games are no longer profitable rather than there being a need to make them better.
I imagine everything you see in the trailer is in-engine footage, even if it’s not being controlled by the player. This has always been the case with GTA trailers since GTA3.