I think there is a long-term material impact of this kind of achievement in making it harder to peddle several of the falsehoods of "bear" negative campaigning (i.e., Musk being a conman, Tesla having no technological moat,...). That is, more about changing the background context about what narratives are credible or not in evaluating Tesla, rather than some immediate catalyst for the stock.
Part of negative campaigning is muffling coverage of positives as well as the flooding of hit pieces. Muffling coverage of positives by not covering them at all, or burying any reporting and giving a misleading, dismissive spin. As far as I've observed, the media has had strikingly little coverage or excitement about this milestone event. I scanned Yahoo's homepage the past few days, and the SpaceX story was 20 or so items down that page each day (and, followed two to three other Elon or Tesla stories, though they may have shown me those to me based on my history of clicking on Tesla stories). The Reuters story I found there on SpaceX today had this inaccurate and belittling headline (though not necessarily by intent) "SpaceX launches first recycled rocket in test of cost-cutting model."
I think supporters of Ron Paul or Bernie Sanders would understand quite well what we're experiencing (purposely picked two quite dissimilar potentially disruptive political movements to make a point about the media and cronyism, not the merits of either movement's political views).