I use Twitter primarily because of the network effect -- and secondarily because of the benefits of the 140-character narrative. (In particular, this allows for a much higher density view than I get with G+.) As for syndicating across multiple networks: I don't really see how I would lose Twitter followers -- and if I lose G+ followers over it, then G+ was probably never meant to be (at least for me). But I think you raise the essential question: is G+ meant to be different or better? And if better, how am I to migrate from Twitter (or FB) without having to manage two social networks?
I think it's meant to be different, not better (or at least that is how it is right now). It allows the follower model of Twitter but with the long form post ability (+profiles/photos) of Facebook. For me they are all best used separately: Facebook for friends & family; twitter for news/content that won't instigate discussions; Google+ for blog post style content and discussions.
