Team collaboration features in OmniFocus will probably work best if there was OmniFocus for Windows and Android or a web version of OmniFocus.
OmniFocus is located in an Apple-focused ecosystem. This limits the opportunities for a collaborative OmniFocus in a multi-platform office environment.
If you notice, most of the team collaborative project/task managers have to be crossplatformable (Windows, Mac, Android, iOS, web-based),
OmniFocus for teams will be a hard sell unless you are working in an Apple deice based office.
A crossplatform version of OmniFocus will have to come out first before team collaboration features get integrated. An Android version and Windows version might not be needed if there was an OmniFocus web version available. This would allow Android and Windows users a way into the OmniFocus world.