I was talking about this with someone the other day. There's no denying DW is something of a liability, as he has a track record of putting his foot in mouth and his behaviour on BGT certainly looks bad. But even outside of that, his books won't be relevant forever and having a whole area of the park dedicated to him seems quite short sighted. Many teachers seem uncomfortable having his books in their classrooms due to his reliance on lazy stereotypes, and I can see them ageing very poorly (they already seem quite dated, at least to me).
Why they didn't choose a more 'timeless' but still fun property like Horrible Histories I'll never know, if they were absolutely set on having an IP. Horrible Histories would actually make a lot of sense; AT have made deals previously with BBC for CBeebies Land, they could tie it into the AT Dungeon and Horrible Histories is still very popular with kids.
So whether it's due to some big controversy or due to irrelevance, I can fully see the area being re-themed in at least the next 5 years.