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I am assuming that since everyone can heal and there are no dedicated healers that everyone can tank and there are no dedicated tanks (would be silly to say we want groups to not have to look for healers and then require groups to look for tanks).
So...will there never be a monster that can 1 shot a non tank class since everyone can tank? No longer will we have 5 people chaining heals on one person so they can withstand 30,000 point crits?
Or will a 40 man raid against a world boss just be a free for all with everyone grabbing agro, dying, then getting battle rezzed.
That could be quite interesting actually.