So your point is that instead of doing the things and making the products they're good at, countries should do the things and make the products that they're bad at?
No, I think it's that when your entire country isn't good at anything (except flippin' burgers) you are unlikely to be rich, in the conventional sense.
We used to clearly lead the world in dozens of industries, automobiles, low cost electronics, high end electronics, motorcycles, bicycles, quality furniture, cotton goods, linnen, steel, small arms (well the Russians were always the volume producers), airplanes, computer hardward, computer software, computer services.
If we lose the lead in all of these (as we already have or are currently) it is hard to see what our export economy will consist of. Gay cowboy movies?