2 hour long meta events with a chance to get a precursor (say 1 per overflow/event).
Would be a one up to raiding. And much needed large group activity in PVE.
Through all the commotion the one time event caused the one thing that should be unquestionable is that more of these types of events are needed.
People can argue it was easy or too hard but in my opinion getting a large group activity like this in PVE is extremely necessary.
Finding a way to have commander/squad mechanic allow guilds to join the same overflows would be extremely awesome too.
Do it!!!