I believe it happens several times each year, somewhere in the world. Does not appear to have caused a crash in scheduled airline service.

Any copilot/FO could fly and land the airplane safely. The second pilot is there for:

- Redundnacy, for exactly this situation.
- Double check to catch mistakes.
- Help with the workload in extremely busy situations such as operations in some large airports and system malfunctions.

Odds are very low that you would have another emergency occur on any given flight.

A few super-low time FO's might fail in this situation if they had something like an engine fire/failure with Wx down to CAT-II minimums, but I and most others would have no problem.