Hans-Werner,
A real interesting idea would be to offer to hold the meeting at a
particular site *only* for those peoiple that did not have at least
mbone connectivity suitable for wb and audio, and have none of the
speakers attend, have them all present remotely. 
It would certainly be a first for NANOG, though some IETF WGs have
already done this. While fine for presentations, Q&A or open
discussion becomes tough to moderate.
Curtis