we're a subset of people who do not need convincing that Elon Musk leads groups of people to develop and execute technological advancements further and faster than far more richly funded organizations conventional wisdom views as established, revered, leaders in their fields, e.g. the German automakers, Boeing... (well, I'm guessing some on Boeing, I don't really know enough about the industry to know, but I think they fit this category). SpaceX already has helped to demonstrate what we've seen, and I think it's quite clear that landing that rocket for reuse will signal this as nothing before from SpaceX has to us and everyone else who sees it. in other words, seeing a landing of a rocket on a platform will be a visceral experience of how hollow and disingenuous the "big boys will just squash Tesla when they want to," "anyone can just string together a bunch of laptops batteries," "Musk is all twitter hype and promises about a decade from now", "all he's doing is taking government funds to give the rich a 4th car new toy," and "Musk is just a carnival barker," gibberish is. A good deal of the nonsense written about Musk/Tesla could now be given the short-hand answer, "you mean the guy who led SpaceX to reusable rockets", or "show me the video of "the big boys" sticking a landing of a rocket from orbit" (or for that matter Barnum and Bailey doing this). I'm not saying the stock pops big with the landing, but I do believe it has a short and long term impact on the collective awareness of Musk/Tesla's place in the advancement of technologies.