i know there is more than one way of obtaining stem cell, though it not as productive than extracting them from embryo's and fetuses as such. i think they can be extracted form bone marrow, but they don't get enough out of it and i think they'll find it hard for some ppl to donate some.
and the only thing that really putting a dampener on the research are the numurous religious groups, and there beliefs about humans and stuff. personally, i'm not 2 fund of ending a life (it can even be call a potential life) for the sake of extending or improving one's life.
however we do it all the time, i mean just eating meat is proff of it, and so since these embryos aren't fully developed and in theory they are just developing cells or cells in general. we can say they are lifeless, since they are just like an arm or leg or an organ, etc, just cells.
but if they are able to collect them from different source, there would be such a big problem there is now... but there is always the problem where if we wont do it some1 else will. it always happens.