I'm taking an introductory string theory course which focuses on bosonic string theory. The lecturer says to include fermions supersymmetry must be included (aka. superstrings). If we face the event that the LHC fails to find any supersymmetry at TeV scale and the physics community lose faith in supersymmetry, are there any alternative ways of dealing with fermions in string theory? My knowledge is still very limited (basic QFT), but what comes into my mind is the following: is it possible to quantize the string action using anti-commutation relations? Or maybe this is wrong because string theory gives rise to gravitons with spin 2 which is not spin half?