Cain lacks the means to put them down for good despite having the potential ability to do it. He crushes, shoots, breaks and steamrolls as many as he can (which is a lot) but a gadget/sword/claws/fangs will find the sweet spot eventually and take Cain out. It will be a long and hard fight. The vamps are more likely to find his weakness and sooner than the lycans.
Well.. Unless Cain drags the fight with the vamps until the sun comes up or something.
Robocain's weapons- http://www.imfdb.org/wiki/RoboCop_2#RoboCop_2.2FRoboCain