Adult stem cells behaving like embryonic?

With all the difficulties and ethical concerns over using ambryonic stem cells researchers have been trying to get adult stem cells to behave like embryonic - just so they have the advantage od pluripotency i.e. the ability to become any tissue in the body.
If and when that happens, that will deal with the ethical problems of destroying embryos, but what about the problems of tumor formation? Cells that can differentiate into numerous cell types would be wonderful but the problem still exists of how to control their ability to becoame what you don't want them to become.
And while all this is going on hundreds of people are being helped by their own adult stem cells without any rejection problems or the cells used becoming anything unwanted. Just look at the stories of people condemned to a brief, inactive life by congestive heart failure, ischemic heart disease or cardiomyopathy who after transfusion of their own harvested stem cells are able to pick up their life where it was left off. Stories abound of heart failure patients back playing golf, picking up their grandkids, scuba diving and so on.