I feel like at that point just tell em to play gunz 2 .-. But yeah even if this idea was implemented, I doubt new players would even make that room themselves. I mean they spent an hour practicing double butterfly, they don't want to waste that effort.
But yeah honestly the best we can do is just to engage with the new players we see joining rooms. Regardless of what cool new idea we have, based on what I've seen, the owners don't really have the inclination to do any high (or even medium) effort changes. Frooples is the only one doing the hard carry. But at its current state, it's good enough that if new players have the encouragement of a mentor and play with friendly dudes when they get on then I'm sure we can get some new comers to stay.