Since there will be elder game content in all zones from what Carbine is saying, I think, we can assume dynamic zone downscaling is not going to happen. I do hope mentoring will happen though, even though we have not heard anything about such a feature so far. Mentoring - downscaling to friends level in EQ2, which have been around since 2007 or so - is great. Yes, the balance of how powerful a mentoring character is, that is very unbalance in EQ2, but it is an awesome alternative to making another alt (I ran out of char slots a while ago in WoW, and it sucks, when I am not inclined to deleted my existing higher level characters). In older games, where most zones are levelling content with no reason for higher levels to return, I could see it as an afterthought to make all the old zones interesting to return to on a main character - if the scaling was balanced and the reward fitted the right level for the character. On pvp servers it could level the playing field. To me it comes down to proper balancing, both of the power you have, when you are scaled down, and to the rewards you get. Someone scaling down could be at max power for that level in top gear for that level - still more powerful than what one would usual have had going through content while levelling, but not so powerful that the character obsolete any group members participation, and in open pvp some public lowbie teamwork in the zone can turn around a gank fest (community building), which would usually have required whining to higher levels in the guild. As reward, I could see a low random chance of gaining some sort of token currency or vanity/appearance items, when mentoring down and in group with lower levels.