Leave the Old Wizard City questline as an option for new characters?
It's kind of a shame that it's no longer available when I create a new character. Personally, I prefer it.
When it comes to overwriting classic content, even if the new content is superior, on principle I think the old content should still be available. Maybe on your second (or higher) character, you can get an option to play the original questline.
This shouldn't be too difficult, since the old quests still exist. If you have a character created before the changes, you still have the old questline, fully functional. All I ask is to have access to it once again.