I don't see much benefit from top townies meeting by themselves, they can't question anyone except themselves, so all they can do is over-analyze everything that happened during previous DP, something that any Player can do, this Mechanic isn't needed for that.
As i said, it only speeds up the game, but Scum posts will remain the same.
But with Scum being in the Meeting, we get to see more material & reads & potential slips to catch them
If most of them are Scum then perfect, we caught them
If half of them are Scum then equally great because we are gonna see some debates and the townie side will catch them
If most of them are townies then no harm done, just extra posts from town side
Trying to say something 
please don't shoot me guys. I'm just a poor boy and nobody loves me..