You have just precisely described the typical path of the typical politician who goes on to become a member of the Permanent Political Class and a typical tool of the media and lobbyists. That is exactly what has gotten us into this mess. No, thanks.
By the way, Trump has mentioned Carl Icahn several times, who is renowned in top-tier business circles. I'm sure there are many others who would like to lend a hand to the project of rebuilding our economy and our borders.
A one or two term office doesn't a career politician make. But it does give some experience in governing & governmental operations. Business is not the same as government. The two are very different concepts.
Since being successful in business now qualifies anyone then we should be begging for Buffet or Soros to run also because they succeeded in business?
Reagan held one office for two terms as governor then ran as POTUS. That is a huge difference. Reagan had a standing stable record we had to judge him on.
Cruz is a first term senator who unlike Obama has acted like a senator and Cruz has taken on the establishment Liberals in both parties including Mitch McConnell very few others have the guts to do it seems. Cruz would not have the severe learning curve Trump would have and again Trump is so off the wall we have no clue as too whom he would appoint. Walker has also stood up to the DEMs. Not perfect but some needed experience. At this point we do not need another Egotistical POTUS doing On The Job Training. We can't afford that risk.