I’ve never seen actual stats, but I wouldn’t be surprised if a majority of people who withdraw retirement funds early end up not replacing the money. I wouldn’t even be surprised if this also included 401k loans; Someone takes a loan, begins paying it back over a 5-year period via payroll deductions, loses their job or otherwise changes jobs, stops repayments, and it becomes a taxable withdrawal plus penalty in some cases.
THIS is why is is almost always advisable to NOT take money out of retirement funds until retirement. There are all sorts of adages about it (“you can’t borrow to fund retirement”, etc).