There's already available evidence that contradicts that prediction. Eve[1] is rolling out a firmware update for Matter support that makes their devices usable across all Matter supported platforms. There are some features that aren't yet available at the Matter level so those will remain in their own app for now. Despite being iOS-only previously with Matter support they're now also reaching Android devices and are working on an Android app for it too to cover the missing features in Matter.

[1]: https://www.theverge.com/2022/12/12/23505097/matter-eve-firm...