Researchers and practitioners are making dramatic progress in producing usable human tissues via (highly modified) 3D printers. Although we aren’t there yet, eventually we can expect to see whole kidneys, livers, hearts, and lungs produced in vats or via printer-like devices. These will be a godsend for patients who otherwise would be looking for an organ transplant (no danger of rejection when it’s your own organ.)
And down the road, people might start swapping out organs just as part of a maintenance program. If young blood can make you more youthful, what might a whole new heart do? For that matter, can we produce our own “young” blood?
Can we print out new eyes with perfect vision, new ears with perfect hearing?
Nice straight new teeth?
And why stop at old body, new parts? How long before we can print out (not clone, mind you) a whole new body and just pop our brains into it?