[Baertram]

I won't replace it. Currently I try to add an extra icon (the scroll from the guild roster overview) and add the tooltip with the online/total members of each guild you are joined to.

Maybe I'll add tetx to the right of the icon too afterwards, but getting the online mmebers of a guild seems to be quite painfull (loop all members of a guild and check the status with GetGuildMemberInfo(...)), or i'm missing just a simple function that does it :-)

Edit:
Got an easier way :-)
local numGuildMembers, numOnline = GetGuildInfo(guildId)