They are totally dissonant channels that have some overlap. Expecting Twitter to replace controlled curation is a recipe for noise. The value in RSS is some process or person is curating a defined set of data - the reliability of even organizational Twitter accounts doing that is such that doesn't work.
Further, the buy-in on using Twitter as a transmission medium hasn't really reached the saturation point that RSS did at its peak.
And finally, relying on a third-party - especially one with as dubious a history as Twitter - to maintain your data in foreseeable perpetuity is a bad plan in general. The benefit of RSS was that it was a standard, not a service itself.
Expecting Twitter to replace controlled curation is a recipe for noise. The value in RSS is some process or person is curating a defined set of data
To a certain extent, this is why email newsletters have had a resurgence in recent years. They allow curation while using a delivery mechanism almost every Internet user uses and understands (email, instead of an RSS client/service).
Further, the buy-in on using Twitter as a transmission medium hasn't really reached the saturation point that RSS did at its peak.
And finally, relying on a third-party - especially one with as dubious a history as Twitter - to maintain your data in foreseeable perpetuity is a bad plan in general. The benefit of RSS was that it was a standard, not a service itself.