It all depends...
on whether the recent findings translate into more political support for space exploration. In short, I mean funding the project. No bucks, no Buck Rogers. We could certainly have humans on Mars by 2034. We could do it by 2024, although that would require getting started pretty quick. However, unless there is funding to pay for it and the political will to sustain the funding for decades, the missions aren't likely to ever happen, at least not by Americans.