This a common sentiment and based, I think, on a misconception. I am thus replying here to you and everyone else that expresses this sentiment.
Disney is not going to design a show which cannot be viewed by children. It cost tens of million dollars to design and build World of Color and Disney wants kids to see it. Yes, you may have to work a little harder to get a good viewing spot. But kids will be able to see it.
The WOC area has been rebuilt in recent months with terraces added to allow for a better viewing experience. Will it be perfect? I doubt it, like Fantasmic viewing is not perfect. But it does work.
See recent information from the Al Lutz March 30 update on MiceAge:
http://miceage.micechat.com/allutz/al033010a.htm
And there are some helpful photos in this week's MousePlanet's DLR Park Update:
http://www.mouseplanet.com/9169/Disneyland_Resort_Update
Disney wants to get this right and not have a bunch of complaining guests. I am sure they are working hard to make this as positive an experience as possible. They are using their Fantasmic knowledge built up over 15+ years to guide them.
Everything is going to be OK!