There are companies that are in the business of managing investments for the very long term and are regulated so as to minimize the risks of bankruptcy. You or you company can incrementally buy a pension from such a company in the form of a deferred annuity.
The only disadvantage to a defined contribution plan with a deferred annuity option is that you and your employer can't mutually pretend there's such a thing as a free lunch in the form of risk free investments with eight percent returns. But on balance I'd consider that a good thing.
This is evidently not true, as employers did not, when discontinuing pensions, add equal economic value in other compensation. Pensions are a retention program as well as a compensation program.