That begs the question as to what d-wade is worth ...
I'm going to guess that when you factor in salary and endorsements he has made $75 million so far. He is making $16 million this year and was making "only" $4 million as late as 2006.
From that $75 million, subtract 10% for agent fees, 30% for the market decline (he has to invest this in something, and if its munis, let hope it was not auction rate perferreds), his divorce (these can cost a ton!!), his philanthropy and an NBA players penchant for freely spending money and I'll guess he is worth $20 to $30 million right now.
Now remember the question was anyone alumni worth more than Wade now, not in 5 years. Yes, he could easily earn another $100+ million in the next five years, and when that happens we can revisit this question.
If the hurdle is $25 million (mid-point of the $20 to $30 million guess), then I'll bet a lot of the alumni in my list, and others mentioned in this thread are worth more than that. Remember a CEO in his 60s that makes $1 to $2 million a year, and has been doing it for 20+years, and started investing in the market when the Dow Jones was less than 1,000, has not been divorced and does not live the free spending life style of a Wade, could easily be worth $30 to $40 million right now.
Again these are just guesses. Feel free to disagree.
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Added later ... To be clear, I'm answering the question of "net worth" and as I show above, I believe Wade is worth $20 to $30 million right now. I'm not answering the question of how many MU alumni make more than $16 million/year. That is a much smaller list, even the CEO of Goldman Sachs (Lloyd Blankfein) make less than $16 million/year.