To sum up what I'd TRY to do in a nutshell:
1) Keep the internationally known icons big, restore them to huge sales numbers (Batman, Superman, Wonder Woman).
2) Restore former A-listers to their glory of old (Captain Marvel, The Flash, Aquaman, Hawkman).
3) It is commonly accepted that, though DC may have more A-listers than Marvel (only Spider-Man approaches the international fame of the Big Three), Marvel has more B-listers (Daredevil, Ghost Rider, F4, X-men) and less C and D-listers than DC. I'd like to change this. I'd attempt to make DC's "hidden" characters -- that is, characters with huge potential they're not living up to -- on the C and D-list move up to the B-list. Nightwing, Booster Gold, Power Girl, Blue Beetle and others would be in this category.
4) Get rid of the multiverses, or at least narrow them down, in order to make it easier to get new readers into DCU.
5) Retcon the resurrection of Jason Todd -.-