I am a happy nabu casa subscriber and my family primarily uses Alexa as the interface to all the smart home “things”, but I would really love to replace it with Home Assistant’s own “Assist” voice assistant.
Nabu Casa would have to convince Sonos to add its voice assistant to their (proprietary) products.
As a Sonos owner, I would welcome it but I have no illusions that Sonos would agree to it.
Even if they did, it would be far in the future because their software development team is still struggling to fix crippling bugs they introduced back in May 2024 when they released a completely new version of their app. The debacle caused a major backlash from their customers, postponed the release of new products, and seriously devalued their stock price.
Let’s just say they’re not currently in the best condition to welcome this kind of project.