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Speaking on behalf of the authors of these proposals, we consider the Swift Concurrency effort incompletion until we have all of async/await + structured concurrency + actors. This is why we started with the bundle of proposals under a unified roadmap. So, we're committed to following through with the full set of proposals.
For the Structured Concurrency proposal, it's undergoing some revision based on pitch feedback, but my read of it is that there is significant consensus on the basic model, and we're hammering out details. (And if anyone disagrees with that assessment, please let's discuss it on the structured concurrency thread or wait for the second pitch on structured concurrency), so I'm fairly confident that one will go through the review shortly after this one completes. The implementation of all of these is proceeding... err... concurrently.
Doug