Alright, good, we're getting somewhere.
If a near-complete solution to group harassers would take 5-10 years, I would definitely be in favor of group banning. But that's not how long I'm asking you to wait. I'm asking for a week to a month of planning (not years) dedicated to finding a better (not necessarily complete) solution, and unless ROBLOX starts on group banning immediately right now (which is doubtful since they have other things on their plate), that gives us plenty of time to come up with a better solution by the time they're ready to work on it.
If we can't find a better solution, group banning is the way to go, but if we can find a better solution, we would feel significantly better not having to deal with group harassers as much. I don't think that's much to ask. Also keep in mind that group banning isn't going to be implemented instantly once/if ROBLOX decides to work on it. If we can come up with a better solution before ROBLOX starts on it, it would probably take around the same time to implement.