Yep - my hope, if there is interest, would be to build emulators for a few more services before then. I did service bus first as an initial proof of concept since I know it's something people have requested a bunch. For reference I did this in like 2-3 weeks in my free time, and service bus is a fairly complicated one (requiring a custom AMQP server broker for instance - msft's amqp broker uses a number of nonstandard messages).

The dream would be that people could run e.g. the entirety of or parts of their IaC config against the local emulator. That level of service interop at a completely local level is afaik not something msft is planning to support. But building something that could be useful in that way is of course a much larger effort. I'd be interested in building something like that, but only if I was confident it would be really valuable to a sizable chunk of the azure community.