So what I now understand about your posts is that you are not speaking at all to this most recent discovery, but rather to a potential future discovery??
You refer to the possibility that these cells will be completely reprogrammed in the future so that eggs are no longer used in reproduction. While nothing is out of the realm of possibility, I don’t think we are as close to this possibility as you do. Making babies out of skin cells is still in the realm of science fiction, and I hope that it stays that way.
If this discovery actually has the great significance for future stem-cell based research and therapies that is the basis for all the hoopla surrounding the announcement, then this discovery has made the same degree of progress towards producing viable embryos as towards producing new stem-cell based treatments that had previously been believed to be unachievable without using originally embryonic stem cells.
The origin of germ cells — i.e. sperm and egg cells — from embryonic cells occurs very, very early in embryonic development. It is therefore highly unlikely that a cell that has been been de-programmed, but not far enough back to produce germ cells, would have the capacity to produce an unlimited variety of other cell types. That’s such a critical differentiation process that it’s not located off on some minor tangent; IOW a cell that couldn’t do that would be a seriously defective embryonic cell lacking other key capabilities as well. And if it IS far enough back in the differentiation process to produce germ cells, it’s so close to a completely undifferentiated embryo that it’s very unlikely not to retain the capacity to develop into a full organism. Most identical twin humans arise at the blastocyst stage, which is after differentiation into at least 2 cell types has occurred, so at least through that stage, complete new organisms easily arise. In other words, you wouldn’t even need to de-program cells all the way back to the stage of a 4-8 cell embryo (i.e. totally undifferentiated) in order for them to produce viable embryos.