Hell yeah, they'll do a season of moderate to heavy use then need replacing.
AFAIK the jaws on the pedal usually give up the ghost after 4 or 5 years.
Or at least the operation will be sloppy as hell and not at all useful, some will carry on well past this point and just live with it.
If you have a waggly pedalling style or use them on something like a stop start commute, they'll go quicker, if your are pretty up and down and don't unclip much, they'll last longer.