Kinda disagree. If adding more races takes away from resources that could make the preexisting races more in-depth, I would prefer the efforts be spent on increasing depth, as opposed to increasing character customization options. I don't think more customization choices are necessary; I would rather the already existing customization choices be given more depth.
I wouldn't be against the addition of 1 or 2 additional races beyond PHB, if it enhanced the overall experience (i.e., those races are somehow necessary to the total game experience).