I like the idea of relocatable modules. It is almost to say everything defined by the IETF should be a grouping, allowing others to assemble the pieces as they see fit. I do not think it makes sense for IETF to define an uber structure, especially using a language mandating forever backwards compatibility...
How to support logical/virtual systems is a bigger discussion. Certainly there is a huge data model overlap between the host system and the logical systems, but some data may only exist in the host system and some data may only exist in a logical system. Making things more interesting, some data in the host system (e.g., an interface) can be exported to a logical system as a read-only value. The way I solved this in another life was using conditional enablement [1] on a shared data model to indicate the applicability of nodes in a context. [1] https://tools.ietf.org/html/draft-kwatsen-conditional-enablement-00 Kent, as a contributor
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