I don't see any reference to downloading the content to use inside of a third party learning management system, so I don't see how SCORM compliance would be relevant. Although, the ability to take the content with you would be great.
One thing I have built in situations similar to this is build a SCORM wrapper that can load the content in an iframe and translate scoring and tracking data back to the LMS. They could do this while still maintaining a fully hosted content model. Many of my clients will not consider an authoring tool for content that cannot be hosted in their LMS.
The ability to take the content with you, I think, is crucial. A lot of the existing learning management systems have very poor functionality, so it might be neat to use Open as a central control panel for these lessons, and push them to your relevant LMS when appropriate.
One thing I have built in situations similar to this is build a SCORM wrapper that can load the content in an iframe and translate scoring and tracking data back to the LMS. They could do this while still maintaining a fully hosted content model. Many of my clients will not consider an authoring tool for content that cannot be hosted in their LMS.