The phrase "to become useless" means to lose one's ability or purpose, to no longer be able to perform a task or fulfill its intended function.
Sentences with «to become useless»
About 60 percent of land areas producing beans could also become useless in the near future as a result of the increasing global temperature. (techtimes.com)
The result would be that all devices using the older version would basically become useless for new books until it was upgraded to the new DRM requirements. (nocturnal-lives.com)
Unfortunately all of that test knowledge, all of that accumulated knowledge we thought was worth knowing, becomes useless if not used. (gse.harvard.edu)