> There are a bunch of companies actively working in bringing AI into robots, so they can make your dishes.

I know, I'm excited to buy the first relatively affordable ones.

  > Also, if enough people are going for the same backup plan it might not work out.

Sure, could happen. You can't really plan for the future -- we like to think we can, but the best you can do is set your goals and deal with the hand life gives you along the way.

  > Why should anyone book you as a personal trainer instead of the other 500 guys in town.

I'm not particularly worried about this, but that's an individual thing based on network/connections and life history that doesn't apply to everyone.