Yeah, the biggest test IMHO is to see how the online team responds to issues. How long till tickets get resolved, how long till a fix is published, how long do the servers go down when they need to, how quickly do they balance classes that need attention? etc.
And... after 3 months, if you haven't heard anything about the next update... that is a good warning as well.
Star Wars has so much Lore behind it, it will die slower than others. Many will stay just to be IN Star Wars... happens right now with LOTRO. LOTRO isn't horrible, but horrible decisions and support IN that game are often over looked because the lore is so rich.