Le WFP a d'ailleurs publié un article, à ce sujet.
Voici mon commentaire à cet article:
It makes sense to have domain names with accents if the intent is to mimic real life but if coherence is the goal, then English-ony characters are enough.
As with anything, people will want a piece of the biggest names, like école.ca, éducation.ca, québec.ca, montréal.ca, hôtel.ca, croisière.ca and so on...