1. Merge Servers; many servers are dead.
2. More ways to gain reputation, including being able to get rep. from BGs, because not all the rep. rewards are PVE oriented, as there are mounts and what not.
3. Remove LFR, and LFD; bring the community back together.
4. Make gold a faction, and server wide currency, so we don't have to continually mail it to alts.
5. Paid profession transfer, so if we want to change professions we can without having to completely level them up again.
6. Add in a sanctuary like Dalaran for the next expansion, and those thereafter.
7. Make another awesome world PvP zone like Wintergrasp.