I bring this up because I wonder if just such a system would help address or perhaps even destroy the 10/25-man raid debate in World of Warcraft. What is there was no fixed raid size? What if raids were any group up to 25 players, and the trash and bosses simply scaled themselves for the size of the group?
You see threads on the forums constantly debating the back and forth on 10- vs. 25-man raiding, exclaiming how 25-man raids are dying out, which I find undeniably true purely based on the logistics of each size of raid, and so on. I'm sure we've all been in a situation where we wanted to raid but we were a few short. Now, imagine if you could always raid, as long as you had the two tanks and three or four healers ready to go, because the raid would scale itself based on how many people you brought.