Never. Even there's already lots of altcoins existence with more potential than doge. If any of them could replace btc, then it should already happened. But that isn’t possible even if elon invest his all assest with doge for replace btc. Even its easy to attack and manipulate doge in compared of btc. So no need day-dreaming anymore, btc is perfect on its current position.
we heard too many about doge become new bitcoin or maybe altcoin that hoped could be btc or eth killer. but all of this was nothinng, doge price still below$1 and its price depend on bitcoin movement.