I was walking through a shopping mall around the holidays and passed a kiosk that was offering on-the-spot teeth whitening. There were three or four people sitting in chairs with special trays in their mouths. Somewhere else in the mall, there was most likely a kiosk that offered ear, lip, eye, and belly-button piercing. Within a 20 mile radius, there was probably a tattoo parlor or two.
Hair transplantation could likely become a service offered in a botique the same way permanent hair removal is. The tools and techniques certainly still have a few generations of refinement to go, but it's not unreasonable to imagine one day going to some local 'hair design parlor' with credentials hanging on the wall the same way a respectable tattoo shop does.
Consider that people could even eventually want designer configurations. Making the hair on my chest form the shape of an eagle or covering my face in thick hair to resemble a werewolf might be a bit extreme, but their are people who have metal horns screwed into their foreheads and tiny beads placed beneath the skin, sometimes even along the shaft of their penis.
And in that same respect, it's not ludicrous to imagine one day, perhaps far into the future, seeing a late night infomercial selling you a kit or a gizmo that enables at-home do-it-yourself hair transplantation. It's would be a natural function of capitalism.
So as much as MetalHeadDude's suggestion seems laughable in the present tense, I guarantee he's not the only one who has thought about this. There are some parties that have a vested interest in convincing you it's impossible, instead of just improbable. Time will tell.