Haven't seen much of Schwab, but I'd guess that if you know your sports trivia (which I don't), it would be no different than clearing a category on J!
Personally, I would honestly say that NG and Tattle Tales still have a bit of a play-along element. Even though there's not one concrete answer (like with Millionaire or J!), I could still see the average viewer predicting what one of the newlyweds would say about their spouse. And the weak play-along factor is slightly compensated by the silly answers and/or anecdotes given by some couples.
I think nowadays, with the average attention span being about the size of a raisin, play-along definitely helps a show. And I don't just mean "What's My Line." There has to be some intriguing hook to the format...don't know what it is, but there has to be a hook.
OK, enough rambling, if what I said makes no sense, I need sleep, so forgive me. :-)