Every single person with a positive net worth could survive indefinitely with no more income, if they were prepared to make the required lifestyle and spending adjustments. The only reason we all work is because we want to spend more than that.
The relevant calculation isn't savings divided by current spending rate to find how long you could survive, it's savings times 4% to find your currently supportable spending rate. If you could cut your spending down to that, in an emergency, then you could emergency retire today.
My family could do it, even if we both lost our jobs. It would mean making some sacrifices, but we could keep our current home. If we gave up all childcare expenses, youth sports, Netflix, eating out, charitable donations, vacation and holiday spending, random shopping, and paid off our house, then our biggest expenses would be food and property taxes, and our minimum family budget fits neatly inside of 4% of our residual savings. Moving would make it even easier.
That would mean a life of lots more biking and library books and free hobbies like gardening, cooking from scratch, family game nights, and more shopping at goodwill. It doesn't really sound so bad, though I'm sure my kids would hate it.