Re: It'll work.
Cool. With x86 being so widespread in cloud providers I'm not sure I'd want to run the risk of weird issues of developing against a different architecture to the deployment architecture. But if QEMU works well enough then that's great.
As you say though, this may potentially increase the demand for ARM in the cloud (to remove that disparity).
Also for most workloads (running on a JVM, V8, etc.) architecture makes little difference anyway tbh!