Yeah - I've been anxiously watching the same forecasts too. I was planning on calling it on Friday evening - there's supposed to be a dry patch between systems that could work in our favour, but at this point, Saturday doesn't look pretty, and the same weather system seems to be in the picture until Monday(?)
My take is if it's likely to be rain let's reschedule, if it's looking like a dry patch or only light then we'll go if people are up for it - I have to say that some of those descents could be a little sketchy in the wet.
I'll repost on Friday night and take it from there - any other opinions?