The phrase "gotten bandwagon" is not an actual word or phrase, but its components can be analyzed individually. "Gotten" is the past participle of "get," which means to obtain or acquire something. "Bandwagon" refers to a trend or movement that gains popularity and attracts followers. The antonyms for "gotten" include lose, give up, release, surrender, and abandon, while the antonyms for "bandwagon" include individuality, nonconformity, dissent, and opposition. Therefore, one can express opposing ideas or concepts to "gotten bandwagon" by using these antonyms. Alternatively, one could also employ alternative expressions instead.