I am curious on how players think that need for Legendary XP to get from 30 to 32 will impact the content they run to get from 20 to 30.

I personally run a lot of Sharn from 26 on, mostly because it is easy to find groups, but as Sharn is Legendary (level 32) I am considering saving that content until reaching 30 to get the first time bonuses while running Legendary. In all honesty it may not matter much now, but when the level cap goes up to 34 I think there will be a clear shortage of content to run from 20 to 30 if we need to save the Legendary Content for Legendary XP.