One of the reviewers of my conference paper (computer science), which got a *revise & resubmit,* criticized that my conclusions are not well founded in my experiment and that they don’t show my hypothesis. (In detail, there was no control variable, which he correctly remarked.) 

The point is, I wanted to use this experiment to give an idea for the direction of the work following my results and to generalize my previous findings. 

My question is, how could I respond to this comment, as deleting my discussion would cut out a huge part of my work?