A company would be successful in proving the 86 can be reliable with really stiff spring rates, wide slicks, and aero. There will be interest in finding weak points and selling off-the-shelf upgrades for hubs, chassis weak points, etc. As our cars become cheaper and less competitive with newer cars in various racing categories in years to come, autocross and track builds will get wilder. A solid Solo Street Prepared or Prepared class build might be a good place to "hit 'em where they ain't" right now.
However, I really think the Hottest Build of 2017 will be playing god and creating a teenager who can turn into a 86 racecar and fight crime, like the 1980s cartoon
Turbo Teen. No one will give a crap about autocross, track, or rally builds when you plumb the horrifying depths of "evolving."