They already have (i was sick with covid, walking to a store when i suddenly lost online maps and data access), i am using voice/SMS only for 2FA authentication for all my American business, including banking and brokerages. Perhaps they cannot shut the voice down due to some FCC consequences. Scary.
It feels like Google Fi is in maintenance mode. Someone got their promotion and moved on. I used to this the Deprecated by Google memes were harsh, but that will be the last time I rely on a Google product for work or life.