Dilution alopecia is not that big a deal, I have a chi with demodectic mange - that's a bigger problem. Bald patches don't bother them at all, and, it gives you an excuse to buy them more cute clothes.
Besides, you're not getting him for his gorgeous coat and color, right? You're adopting a new family member and best friend - looks are superficial, it's what's in his heart that counts. And I bet he would LOVE to have you in his heart.