I felt nostalgic, put the Abyss back online one day for about 35 minutes. Me and my lead GM walked around, looked at each other, and said "f**k this" and took it down again.
Way to unbalanced, way to "simple", hacks galore, many quests and terrain maps broken, utilizes only about 1/4th the entire world in content, and without a constant GM/Dev presence, people simply quit. Amra's advice is best; wipe everything and start clean. Or better yet, let the classic memory stay a memory and lead players to new, fresh servers.
It was popular while it was up. So if that's your thing, give it a whirl. Just don't ever log yourself in
You might get inspired to "fix" something.