Here's what rhymes with mainstreaming.

Consider these alternatives

institutionalization / relation multiculturalism / culturalism socialization / relation universalization / relation sexualities / localities stereotyping / writing alleviation / relation prioritizing / rising assimilation / information rationalization / relation conceptualization / relation facilitation / education discriminatory / story commodification / education environmentalism / given impedes / needs sensitization / education objectification / education feminism / given regionalization / relation coeducation / education commercializing / rising necessitates / states mitigates / states militate / state objectify / high politicization / information busing / nothing actualize / size commercialization / relation localism / given formalization / ormalization