This is the direction of technology, well-intentioned or evil, that will accelerate evolution.
Sexual reproduction, based on binary models, where the DNA of two people are combined to form one individual, and with it, usually the intact genes of either parent being prominent, is bound to be inferior to a system where the defect-free genes of three or more (greater the number, better the quality of the genes available) people are combined to form a new individual.
Hitler would have craved for such technology. Time will tell where all this will lead us to.
Cool, next 3-somes will be asking for the right to marry!