Designs using LM741 will continue to work correctly as long as the part is available. Where you can get into trouble is using it inappropriately. Schools are still having students use it. Any issues are more likely to be caused by the user, not the opamp.Then you would love the next exercise, Amplifier Design Using Op Amps: A Sound System. Using an LM741 as a sound amplifier, as does all of the op amp exercises in this ancient book.