Stem cells are *very* sparse in amniotic fluid. That's why they went unnoticed for so long. And "some of the characteristics" is not the same as true totipotentiality.
Embryonic stem cells, harvested from a viable blastocyst, are unique. As I said, it isn't yet known whether there are therapeutic regimens that absolutely require embryonic stem cells -- as opposed to other stem cells -- or not. Unfortunately, because embryonic stem cells are unique, it's quite likely that such therapeutic applications will be found. What I'm saying is that, IF such applications are found, THEN the demand for embryonic stem cells will exponentiate and other sources will be in demand. And by the inflexible law of supply and demand, a supply will be found.
No, cloning of human embryoes is not yet feasible. It will be soon, but not yet. What can be done is to culture embryonic stem cells -- undifferentiated, totipotent stem cells -- in a non-human matrix. Usually, mouse eggs. The trouble with this techinique is that the human DNA is frequently contaminated with the host DNA. That's what's wrong with the Shrubbie's famous "stem cell lines."