It seems almost inevitable to me that large swathes of non-white populations will be able to pass as white if CRISPR ever gets perfected. Phenotype mainly consists of two things:
1) Pigmentation - We know that pigmentation is not ancestry; it is simply correlated with it. Therefore, anyone can theoretically be any color while maintaining 99.99% of their genetic selves; only the alleles associated with pigmentation would be different.
2) Facial morphology - Off the top of my head, it seems that almost every, if not every region in the world has at least some individuals that fall into the "European" zone of facial morphology. This is particularly true for regions from W.Eurasia (MENA, India, and parts of east Africa/central Asia).
Conservative estimate, people would be able to become "close to white". Even if a complete transformation of all pigment alleles is not possible, we still know of only a handful of alleles that control a disproportionate amount, sometimes the vast majority, of pigmentation: ncbi.nlm.nih.gov
Something similar happens with skin tone, where two genes make the difference between the blackest black and a medium-skinned Arab.