2) Old Content Needs Reworked

All of the old maps are basically worthless now. They are completely empty and rarely used. The only times they are visited, are when there is a rare boss spawn, pet battle daily, or a raid entrance is there. Even if a raid entrance is there, the only time people go do them is when they want to farm a transmog, or certain material. There is currently no long term reason to go back to the countless maps from previous content.

Icecrown Citadel, from the Wrath of The Lich King Expansion

There are a couple different routes we could go to make use of the old maps and content. There could be exciting dailies with good rewards on these maps. The dailies could make you interact with the map. There could be instanced zones on these maps for only max level characters where daily or weekly events could be scheduled there. Maybe even have a end level scaled queue system for those raids and dungeons 24/7.