ilvl requirement is honestly useless, from past experience from MMOs it's the very bare minimum for a good group to clear the dungeon. For the average/below average group, the required ilvl would be slightly higher than the requirement set by the Devs. However it does prevent people who expect to be carried without ever changing their gear and using only the stuff they found along the way to 50 from queuing.

Therefore those who are worried about being locked out due to the requirements, I don't think there would be anything to be worried about.