What a wonderful surprise! I had no idea PNAS was doing a commentary on our paper, and then I found this excellent piece written by Jennifer Farrell and Sam Brown (Georgia Tech). They end their piece hoping that Will Harcombe (now at U. Minnesota) continued to evolve the two-species system described in this paper. Thankfully I know the answer is yes, and there will be more good stuff to come that he has carried forward in his own lab.