You'd have to hope the following with Drew leaving.
1. 4680 is basically done and they are just copying the lines
2. FSD is now the only mission of the company and they are basically ready to go.
3. Megapack is a copy and paste to build more storage.
Because if those are true then the company makes its shift to transportation as a service with a minor side of car sales and continues to build Optimus....tack on megapack and you have the next 10 years figured out. Maybe he sees his work as done and the effort required at Tesla is beyond what he wants to do. I'm sure he's in the 100's of millions in options or stock.
If some or none of these are true, it tells me that Elon has basically decreed that they are solely focused on FSD and next gen car and Drew doesn't see it. You combine that with production layoffs I think they are fine with the 1.5M+ premium cars, SUV's and trucks per year, with the intent to automate most of the Robotaxi.