Perhaps in future years we could request that participants upload the original (give or take a little cropping/rotation/other things that wouldn't be seen as affecting the 'authenticity' of the photo) as well as the HDR'd version?
This will not end well. To put it mildly.
Start with the technical issues. 5DIII does in camera HDR as does any camera that you can instal Magic Lantern on. Originals are impossible to upload since commons doesn't support RAW.
More politically authenticity is a very charged word in photo circles (insert claims about amount of stuff done in darkrooms). Wikipedia deals with it by not caring.
The issue is best dealt with by choosing judges that don't like over the top tone mapping.