Given that primary premise of historical thought, the following has little content, but I put it here as interesting speculation
Given human history, 1945 to 2018, The Class War is ended, and capital has triumphed. Nevertheless, it is best to go down fighting.
P.S. The definition of right opportunism is an over-estimation of the strength of the working class, an underestimation of the strength of the working class.
The definition of left opportunism is an overestimation of the strength of capital, an underestimation of the strength of the working class.