Great question. I think there are strong reasons for anticipating the total number of apocalyptic terrorists and ecoterrorists to nontrivially increase in the future. I've written two papers on the former, linked below. There's weaker evidence to suggest that environmental instability will exacerbate conflicts in general, and consequently produce more malicious agents with idiosyncratic motives. As for the others -- not sure! I suspect we'll have at least one superintelligence around by the end of the century.