We should have a server which any player from any server can join with his stats, lvl and equipped gear carrying over (read: equipped gear, not the whole inventory), but if you get murdered in that world (pvp) you get knocked back to lvl 0 (nothing changes in your main server). Carns would not exist in this world (blue stars become yellow stars) so lvl 0 is back to square one in all cases.
Would be fun to play and an interesting experiment for DEVs to weight the future updates against (limit pvp as per the current trend or let it free for self policing).