As it stands, the person making the decision could be doing so for totally arbitrary reasons. It doesn't appear that there's an established process or criteria in place beyond "I don't feel like I'd hire X now" -- the rationale "Because Executive Y says so" is not transparent in the slightest.
But anybody who has been paying attention has known that any job is "just a stint" since at least the 90's, if not the 80's. A big part of the Re-engineering[1] push of the 90's involved reducing costs, at least in part by reducing head-count. And before that, you had the 80's LBO[2] craze, which resulted in dramatic layoffs at many companies.
As a Gen-X'er who grew up in the 80's, I have never expected to have a life-long career at a single company, and I can't imagine many - if any - of my peers imagining that either. In this regard, there's nothing unique at Netflix. All jobs are essentially "temp" jobs in this day and age.
[1]: https://en.wikipedia.org/wiki/Business_process_reengineering