They will, but it incentivizes the creation of a "few extra" for this purpose.But the embryos will be destroyed anyway. If he opposed destroying life he should have passed a law banning fertility clinics from discarding embryos. He didn't do that. He instead attacked embryonic stem cell research. That being the case I think it is quite accurate to describe Bush as being against further development of stem cell research.
He didn't do that because it isn't publicly funded. Get the difference? He did not want people to be forced to pay for what they find morally objectionable.
He didn't "attack" it he simply chose not to federally fund one specific type of stem cell research.
The reality is your opinion is not the only measure of "scientific sanity" and controversial issues that create life to research on it are controversial regardless of Bush.