I don't suppose you would care to make a small wager on how most tablets are used, would you?
Yes, many are used essentially as big-screen smart-phones in business, but even then, the vast majority are used for information consumption; very few are used for much besides reading or looking stuff up. For consuming information they are unquestionabley handy, but for most uses, tablets are terrible for creating it; typing on glass and pointing with a half-inch-wide finger makes for terrible ergonomics.
You can trot out the old bromide about salespeople all you want (people have been doing it for well over a decade), but you can't say with straight face that 20% of tablets are used primarily for business; I'd bet the number is much less than 10%.
For the C-level meetings, c'mon. Nobody is more style-obsessed than a high-level corporate guy. Actual business use is not guaranteed by having an iPad in your hand.