noun. Conversion to bourgeois values, loyalties, or tastes.

noun. The taking-up of middle-class attitudes or values; bourgeoisification; the process of becoming affluent.

"David Marquand, one of the central themes of the golden age was 'embourgeoisement': the spread to the working class of the job security, career ladders and lifestyles which had formerly been the prerogatives of the middle class."

upward mobility  

bourgeoisification  upwardly mobile