Hal it is indeed a splendid thought but won't happen for a long time I fear so I'll be watching & waiting for a good few years
This is from the NHS Blood & Transplant site
"The success of this research team in producing megakaryocytes in the laboratory has paved the way for the ultimate goal, manufacturing platelets for transfusion. It will, however be many years before a process for the large scale production of platelets is developed. Donated platelets will still be needed by patients for the foreseeable future, either as part of a blood donation or by dedicated platelet donation using a machine collection process."
Anne