Openvibe is a neat concept, but it's like texts.com: It places different services into a single feed but doesn't solve for interoperability.
The goal of the #Fediverse is to have a single account that can communicate with any other account, regardless of platform. However, with Openvibe, you still manage multiple accounts across multiple platforms.
Personally, I don't want an account on every platform. I want a single account that can communicate with all of them.