I suspect we'll see that; but Siri is in such a bad state of disrepair that Apple really needs something now while they continue to look for micro-scale LLM models that can run well-enough locally. The two things aren't mutually exclusive.

The biggest thing Apple has to do is get a generic pipeline up and running, that can support both cloud and non-cloud models down the road, and integrate with a bunch of local tools for agent-style workloads (e.g. "restart", "audio volume", "take screenshot" as tools that agents via different cloud/local models can call on-device).