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Not so long ago, I dealt with a small austrian company specializing in online titration equipment. The central piece of kit was a DOS-powered box, controlling various pumps, valves and probes, showing trends on an LCD display, and outputting data via 4-20mA analog channels to the DeltaV system.
Speaking with the owner, he was contemplating switching his system to linux, but there definitely was no rush. Of course the whole thing needed updating (think about it, computers exchanging process data over an analog channel which needed calibrating...), but it did the job.
DOS is actually pretty widely used in small/single-purposes embedded systems. It's pretty small, well known and lets your application do whatever it wants.
DOS will be around a lot longer than WFWG or Win95.