If after production and deliver hell of last year and continued layoffs they can still get their employees to volunteer for extra work then Tesla's glory is secured.
I've mentioned this before but I'm pretty certain Tesla is using Agile
Manufacturing.
The goal is "fail faster". Not something you traditionally hear in a manufacturing world. But the idea is that you get all the failures out of the system early and fix them so that you don't encounter them again.
In this case Tesla would have employed short term contract staff to remediate the issues of production and delivery hell whilst it worked out how to resolve those issues. Once resolved the short term staff would no longer be required.
As Agile is cyclical, Tesla would be expected to re-employ, at key stages (such as Model Y start up), in order to meet the goals, whilst working to remove those new staff from the delivery chain later, once the lessons had been learned and the solutions provided.
Even in IT the main incumbents don't really "get" Agile. How could investors in bricks and mortar manufacturing understand?
I expect that Model Y, Gigafactory3 and the 500k vehicle sales will all pass without a recurrence of any of the "hells" already seen.
Whether new "hells" occur is another matter. The whole point of Agile is that once you have learned the lesson you fix it and move on. My brother had a saying in one of his programmes. "We enjoyed making that mistake so much we decided to do it ALL over again".
Ask yourself this. Of the key issues already seen, how many of them have recurred? Now contrast that with the traditional vehicle market. Who seem to be able to make the same mistakes every decade/other decade over and over again, like a metronome.