It's not cemented. I've gone from thinking in whole coin terms to sats terms over time just fine. Commerce will be run under a sats standard, not whole coins. Merchant solutions and spending wallets (phone ⚡) will all just display sats. It's all future coiners will ever be exposed to. They will only need one symbol and it will be the B.
Discussion
Watch normies adopt bitcoin and change the world…
…and call the little guys “bits” with the ₿ symbol. 😂
Oh god 
I’m not doubting people’s ability to shift mentality to sats, just your claim that sats will be called bitcoins. That would be fine and dandy though if it were to eventually happen - the #bitcoin symbol is iconic