Who else is going to be there?

I think the current meta (I call it 2.0) for short is well suited for a number of
issues pertaining  to day-to-day operations and to the SE interface, and 2.0 is
ill-suited for the long term discussions that need to take place to keep
MathOverflow the idea going.  However, if there is only a small group
interested in using Discourse, then I recommend using the old Vanilla forum,
with someone updating 2.0 periodically with a summary of goings on.

**EDIT**
Having seen the Discourse page, I can see where it could lead to the kind
of brainstorming and collaboration needed for the future of MathOverflow.
Again, I think it is important to know how many will participate. The forum
publishing.mathforge.org of Andrew Stacey was and still is a good idea,
but it seems to have very little traffic nowadays.  MathOverflow cannot
enjoy its current success without continual efforts to moderate, promote,
evolve, and discuss.  I know I don't want attempt such discussions on this
meta.