Looks like 30 more years of no extra-earth human spaceflight.
Our thorough exploration of Mars using robotic means has already far exceeded the pre-Apollo robotic exploration of the Moon; it is very much a necessity to do so in advance of human Mars missions, which technically may (or may not) be possible per se right now. My view is that Von Braun’s risk minimizing approach is best and that this robotic exploration is rooted in that.
Von Braun’s idea of going to Mars matured into a follow-on from Apollo. He envisioned assembling the Mars mission in LEO, using a minimum of 12 Saturn V launches (IOW, the entire lunar program and a bit more, just to do one Mars mission).
If enough water were available in near-Earth orbit, using photovoltaics to turn it into hydrogen and oxygen for the fuel for Mars shots (and probably for other interplanetary missions), a big kick engine to push the manned portion of the mission to Mars and back, along with its tank, would be the rest that would be needed from Earth’s surface. The booster would have to be easy to recycle for each leg, as the work would be done in micrograv conditions, and on both ends.
Obviously for this to be feasible, there would also have to be an ample water supply near Mars as well. An automated system to gather the water, deploy photovoltaics, and accumulate the fuel and oxidizer, would have to be launched, probably in modules, to arrive, self-manage, and operate some few years prior to the crew launch. This ensures that the fuel for the return trip would be available before they set out.
This would have to be financed by asteroid mining, which would use much of the same kind of technology. Mars exploration would also have to be with a view of colonization, which IMHO is probably a nutty thing to try for the next, oh, century or so. Meanwhile, a permanent human presence in space, and in orbit around Mars in particular, would have to be established.