Besides I expect Trump to take in Fiorina, Carson, Walker and possibly others into his cabinet

I disagree with Sowell on the "if Trump doesn't win the nomination it would have done a disservice to the rest of the candidates" simply because of two reasons:

1. Trump has shown that speaking your mind and not being apologetic is what people want. This has encouraged another candidate, Scott Walker, to be more bold and advertise his successes. This will also help in vetting candidates.

2. Turnout! Energizing the base by not catering to fringe groups (i.e. Illegals) because politicians expect guaranteed votes from people that make up the party will result in immense voter turnout. I believe it will be so high coming Nov 2016 that even with the millions of illegals voting and the multiple-votes of the democrats the turnout will surpass 60% and will obliterate all cheating votes.

TD:LR Candidates that are honest and speak their mind, letting the public choose rather than conforming to irrelevant interest groups will energize the people who have abstained from voting, increasing turnout tremendously