I think it's more of a lack of any serious discussion on 10-2 itself.
Personally, I find no reason to be opposed to it. I hope something positive can come from all this effort, and hope there's a significant turnout. However, just holding a rally of people who are predominantly progressive and attentive towards the political scene still doesn't really do anything.
We need a fundamental change in the political scene, and this rally won't do a thing. Then again I'm also a pessimist, cynic, and misanthrope - so my thoughts on how much good this rally can do might be skewed.