Wouldn’t it be cool, If you could actually retire a character. Maybe have something in the Hall of Monuments, and building a “Legacy”. Retire the character and it’s statue is added to a collection in the HoM, non-soulbound things dumped into a chest, Money is already account wide so no problem there. But maybe have its personal accomplishments (bring lvl 80, having completed the storyline, having professions at the cap) add to your account wide bonuses. 1% Crafting Exp boost for having 2 maxed out professions, 1% exp for having story completed, 1% magic find for map completion, etc. And then once retired it frees up the character slot.
I think that’s a nifty idea.