The danger of any walkout is that you won't be allowed to walk back in. The time for useful collective action was back when tech companies couldn't hire fast enough, and tech employees enjoyed unusual leverage. After 27,000 layoffs, a performative walkout without a defined goal is just making it easier for Amazon management as they plan the next round of cuts.
If the number is a large enough percentage they couldn't do a lockout. While it may be an industry-wide supply side problem for employees you can't just fire a huge portion of the staff and hire new people and expect things to just keep on truckin', losing that much institutional knowledge would be suicide.
My opinion is generic across all companies. I am not an Amazon employee, nor own any stocks.