It's an interesting idea, but...I am considering taking out half-elves and half-orcs as possible race choices for PCs, and introducing the "Elvish Ancestry" and "Orcish Ancestry" feats which can be taken by humans at 1st level instead.
If these feats simply give you the half-orc or half-elf racial stats on top of human ones, all you've done is created a half-elf or half-orc with one extra skill point per level because they just spend the human's bonus feat on the ancestry.