Trump is not your typical successful business leader. By all accounts he's only headed a boutique, and his big stab at the Casino failed miserably. He's also largely a moron, and has displayed no administrated acumen, or ability to lead and inspire competent indivuduals. Ass kissers and people wanting to ride him for the brand, sure, but that's about it.
This is a guy that delegates everything, and bangs his fist and bullies and otherwise promotes his name/brand. He's rolled the dice big, and on the failures he just uses bankruptcy and other people's money. On the random wins, he will relentlessly market as evidence of his incredible prowess.
No, I think someone like Ross Perot would have done fine. They may have made some mistakes, but the business world is full of incredible resourceful and practical, intelligent individuals, that are entirely up to the challenge. Why would most *want* to though, except for the legacy? They stand to make incredible money in business, with nearly zero of the headache of president.
But in any case, I don't think Trump is a good example of a business person not being suited for office. Trump is an incompetent goon in all respects relevant to POTUS.