I think the reason most have a problem with it can be found in the first sentence of the last paragragh of the column:
When the bell rang, he knew that he had not convinced Bryce, and perhaps many of the others.
To expect the kids to understand the theory is reasonable, and practical. However, it sounds as though that isn't really what this is all about.
It isn't, or they wouldn't be suing school districts into submission when the parents speak their mind and vote to allow the discussion of ID/creation.