On the culturally dictated applications of sticking old brains into new skulls
In the future:
Heads will become viewed less as repositories of the soul or consciousness, and more as recycling bins.
Skulls will become hinged, much like foot-operated trash cans. Of course, the skulls will literally be foot-operated.
As a result, slow dancing will become even riskier.
As usual, this development will be motivated by the defense and entertainment industries. The military will fund development of hinged skulls ostensibly to have resilient new bodies for the brains of top commanders -- along with their guts. However, the skulls will be used mainly by hawkish congressmen who desire credit for not exempting their children from war service. Before any brave congresschildren ship out for duty, their cortexes will be secretly rescued -- and the bodies will ship out with the brains of illegal immigrants instead.
As repayment for this generosity, the sons and daughters will work on their parents' home renovations and landscaping projects. Meanwhile, the sudden upsurge in non-English-speaking recruits will have no measurable effect on the ability of officers to communicate with their men.
On the entertainment side, Hollywood superstars will rush to take advantage of hinged skulls. Actors who have been typecast and want a fresh start will exchange brains with drama students who are impatient for a public. And stars who are just plain tired of fame will change brains with housepets.
As a result, acting will much more frequently be described as "uneven".
On the professional-sports end, eager children will sign up to exchange brains with their favorite basketball stars. However, the kids will soon realize that, even though their allowances get bigger, every day is just like PE. Minus the bathroom breaks.
For a while, though, trading cards will display the faces of star kindergarten dribblers. Autographs in flesh-colored crayon will drive auction prices through the roof.
In the end, the demographic with the highest demand for brain-exchange service will be aging bachelors. However, their only takers will be other aging bachelors.
Meanwhile, stem-cell researches will think all this is silly. As far as they're concerned, a brain isn't something you swap out -- it's something you grow into.