fall out of favor
To no longer be supported, preferred, or highly regarded. John fell out of favor with his boss ever since he managed to drive away the firm's most lucrative client. They were a fad, that's all—they're already falling out of favor.
fall out of favor (with one)
To no longer be supported, accepted, approved of, or regarded highly by one. John fell out of favor with his boss ever since he managed to drive away the firm's most lucrative client. Those stupid toys are just a fad—they'll start falling out of favor sooner or later.