I don't say that the Leaf is
I don't say that the Leaf is dead, just that it's falling behind the competition. I personally think the rot started before Rapidgate in 2017, when they couldn't bring the 62kWh battery version to market to go head-to-head with the Bolt EV. Charging issues and underwhelming specs just compounded that delay.
I'm not convinced that volume production of the Model 3 detracted heavily from Leaf sales. I think Tesla is, realistically, in the newly emerging middle tier of pricing above $40K. Yes, they have options available below that, but I think most current Tesla buyers don't want to skimp on features like Autopilot, so the cost inevitably goes up.