I am sure that we are not going to be the last universally intelligent species on earth, but what shocks me is that we are apparently the first.
Eukaryotic life has only been around for 1.5Bn years, so it must have been after that. You are right; I'd expect that a universally problem solving species would become a tool using apex predator (quite certain to leave traces), but perhaps they didn't get to their singularity.