I admit, I am still a little confused by the premise. There actually aren't any wisdom races anymore from WotC, and it sounds like there'll never be again. Is this just theoretical?
The OP is wondering why there is not +2Wisdom race in the PHB and why WOTC hasn't elevate one of the +2 Wisdom races to the spotlight.
The answer is WOTC is or at least was too afraid of the traditionalist wing of the fandom to push any new races to the core books.