I think certain kinds of lettering will definitely go out of style because of over-saturation (motivational-poster-style lettering, chalk-lettering, etc), but lettering and type design are REALLY diverse fields. It spans everything from really subtle logo work (which will always have a place) to the more illustrative stuff you see all over Pinterest. Good designers have to be agile and adaptable, so I think that people that find themselves caught in the middle of a trend just have to make sure that they're taking on diverse work, and working on diverse projects so that they're not only associated with something that could fall out of favor.
I think certain kinds of lettering will definitely go out of style because of over-saturation (motivational-poster-style lettering, chalk-lettering, etc), but lettering and type design are REALLY diverse fields. It spans everything from really subtle logo work (which will always have a place) to the more illustrative stuff you see all over Pinterest. Good designers have to be agile and adaptable, so I think that people that find themselves caught in the middle of a trend just have to make sure that they're taking on diverse work, and working on diverse projects so that they're not only associated with something that could fall out of favor.