[vertex-four]

Twisted contains a lot more than asyncio does. asyncio is the equivalent of Twisted's Reactors, which are the internal bits which manage the basics of the async event loop, watching file handles, etc; but Twisted contains a great many abstractions on top of that, not to mention the many protocol libraries.

Luckily, a Twisted Reactor can be built on top of asyncio, and this will likely happen as people port more parts of Twisted to Python 3 (it's a long-running project with fairly little interest from developers willing to put work into it).

Alternatively, people could start to build new libraries that implement all the abstractions and protocol implementations that Twisted has to offer. I think it'd be preferred that even if each abstraction/protocol were a separate repo and installable package, they'd all be under the same "banner", so that everything interoperates correctly and using the same set of abstractions.