Just to say,
another point why to detect the online status must be kept in function is for the reason, that this is the only possibility to discover "hidden groups" playing with a dozen avas each member for several reasons.
We have the most important secret services in SL, we have universities who are doing psychological studies on us and after all, we also have groups and single persons, that like to confuse others.
To disvover if an alt is behaving in a way that is typically for non-main-used-avas or to get a better supervision about the possibility if other alts are used by the same user, you need to observe the online behaviour for weeks and months to be sure.
And yes, there is a very smal group of users in SL who are fighting back against those groups, that you can consider as part of the NWO. If we loose this feature, we have no more possibility to discover the names of alts typically used as a spy. We have no more chance to discover and learn about their methods.
So, I see the "cui bono" of disabling the detection of online status for all professionel groups like NSA, CIA, Mossad, FSB, MI6, etc. and universities.
I know, this sounds like strange stuff, weird, but this is reality, RL in SL.