As far as I know there is no overarching plan, but there are many people who do hold that motivation - some are more aggressive about their intent and others ar

As far as I know there is no overarching plan, but there are many people who do hold that motivation - some are more aggressive about their intent and others are more lax, and yet others are skeptical - as with any community of developers. The broad sentiment seems to me that it's a good thing to move over, as pragmatism allows. Personally I'm a converted skeptic - I had my doubts about the language and my initial stabs at it left me somewhat frustrated - but as I've grown to internalize its semantics and behaviour - the benefits in terms of safety and clarity of intent and optimization potential are clear (e.g. aliasing semantics are just so much better). A mix of factors enter into whether a component moves over or not, including the views of the developer in question, the complexity of the API boundary between the main codebase and the subcomponent, and the complexity of the component logic itself.