In a case like this, I don't think the point should be whether Zuckerberg "would actually feel" a consequence: it should be whether the people getting laid off—as in, the ones who were wronged—can feel it.
If you mean unlimited, this seems like an unreasonable expectation. FB employees receive a 4 month severance package, 4 months should be plenty of time to find a job for a developer/office worker.
That's more than fair.
Very generous I'd say.
If your decisions lead to 11,000 people losing their jobs, and you "take responsibility for that", then you should be 11,001.
Plenty of CEOs have blamed the economy, the pipeline, the customers, the competition, the weather, etc. He's accepting he made some decisions that over-extended the company and as a result they have to make difficult layoffs. (Which has happened at every company I've been a part of and is happening at many other companies just in the past week.)
What if you want to hang on, and hope to hire more in the future?