I have no problem with Shaq as a host or presenter or comedic foil. Wasn't there a show by the name "Shaq Vs." at some point? Given how many athletes transition from the field of play to the TV side it is no longer surprising.
I'm curious what the evidence about how people won't watch regular folks play Millionaire. Were figures that easy to slice and dice?
One thing that I think ABC is missing is the utility of money. When David Duchovny was wrong on his $500,000 question he likely could have made up the difference if it was really important to him. It might have been several years but could be done. GSN just did the Top of the Charts block of shows and there were lots of folks who were past their prime and I'm sure the charities were important to them, but the charity wasn't front of mind for at least this viewer, it was each question as it came up on screen.
Go back and watch night two of Super Millionaire. Robert Essig comes off as a regular joe who is happy to be there. Watch as Regis says "and here's a check for $100,000." His demeanor changes. Each new level brings more elation as the money unlocks more opportunities. There are episodes of Debt where just winning a comparatively tiny few thousand dollars means wiping out a huge millstone around the neck of the winner, and the double payoff actually having that cushion to start over in a way.
Deal or No Deal certainly overplayed what the money meant, and the "what will you do if you win the $50,000" has become so trite that it is pro forma, but money is fungible and it has meaning for people. For me, I knew I was unlikely to get on unless I really buckled down and practiced the phone game, and for all of the middle aged white guys on parade, lots of them were married and had kids, and even $32,000 of found money would be useful.
Lots of other shows are able to have regular people come in, play a game and win some stuff and then they are swept into the annals of TV history. Seeing someone win for the Salvation Army or March of Dimes just isn't the same.