Twitter is great. I funnel a lot of stuff from Twitter into Instapaper and Pinboard. But Twitter is a flowing river. I am not on Twitter all day so I miss the clever banter and people complaining about Twitter.2 RSS is time-shifted. RSS is targeted and bounded by my subscriptions.
For these reasons, I don’t use Twitter as an RSS replacement.
Here at the 512 Pixels HQ, I know the site has a lot more RSS subscribers than Twitter followers, for what it’s worth.