Google will only make the switch if you have a device that can run Gemini with more than 2 GB of RAM and Android 10 or later.

This is the first official declaration from Google that the Google Assistant is on its way out, but it’s not like we weren’t expecting it. Gemini is already the default experience on most mainstream Android devices,

Google Assistant is officially dead; it will stop working on most Android devices and will be replaced by Gemini later this year.