It's a matter of when, not if. Might take a few hundred years, in which case you won't have to worry about it unless you're young, seriously invest in life extension technologies, and get really lucky.
Might take 20 years, in which case, better be saving for retirement.
Some have already been replaced.
White Castle Set to Roll Out 100 Flippy Robots - Food On Demand
As well as the aforementioned bar feeders, robot tenders, and pallet pools.
You remember John Henry?
Legend of John Henry's Hammer~Johnny Cash - YouTube