Unfortunately, this is the price you pay for being famous on a national network. 
TWC is going to market these OCMs aggressively by pushing them out into the country and doing so many extra segments with them. Believe me, these three OCMs are certainly feeling a lot of pressure with all the traveling and being the proverbial faces of TWC.
But I doubt they HAVE to do all of this, or are they?
You'd have to look at their contracts or obligation agreements to know for sure. I just know they'll be pushed hard to appear in many things because they're so popular and draw good ratings. That's what any TV network does with their most famous people, but it can still be taxing despite the great wages and benefits they'll receive for doing these extra things.
That's very true about contracts. That's what happened to Conan, since he walked out of a contract before it expired, he can't make ANY TV appearances until after September once the TV Fall Season starts. I would hate to sign a contract where I would be in that kind of predicament, that could be the case with Jim, Steph, and Mike or maybe they don't mind the extra work/assignments.
