Hi Barb,
I can understand your hesitation since I have a "thing" about stomach viruses. I hate to throw up, and I hate it when my kids have to feel that way.
That said, I wonder if some of this is just normal for this time of the year, but the news is reporting it and making it sound extraordinary. Something like the shark attack thing last year or the year before... they made it sound like suddenly there were attacks everywhere, when it turned out they were actually right on the money for a normal year. When the news gets ahold of something, watch out!
I was thinking about it, and I know when someone comes down with a stomach virus in my DS8's class, at least 5 of the 25 kids will be absent. That's 20%, far less than the number on the ship at it's worst. And usually my son doesn't get sick, because he's getting old enough to understand when I say wash your hands.
I think since you are going in with a careful attitude it should be fine. There is certainly no guarantee you wouldn't get something at WDW -- look at all the kids touching stuff there! Buzz Lightyear... germ pool extraordinaire! (I go on it anyway - I figure my endorphins are up so I'm not likely to get sick. lol.)
My guess is that your DS is old enough to take precautions and you certainly can. If they don't clear this up by January I will still go... if the worst happened and we got sick, most of the time we're over that sort of virus within 24 hours anyway.
Good luck making your decision!
Melissa