I will consider Orion only when it is open source.
The original Unix philosophy (McIlroy, Ritchie, Thompson) says nothing about source code licensing. It’s about programs that do one thing well and work together through universal interfaces.
Open source is a distribution and licensing model; conflating it with software openness misrepresents those core tenets. Orion supports Chrome extensions, Firefox extensions, and standard web APIs — that’s interoperability in practice.
That being said, the future is not written ;)