The old saying goes, buy the story, sell the news or something like that.

When EOS launches, there wont be oodles of people launching apps the same day. So if people see the main net and its a whole lot better than what we expected, then sure, we'll see a boost, but the chance of that happening is small since its going to take some time for developers to figure out how to launch the first dapp powered by EOS.

My money is that nothing happens or it goes down a bit within that 24 hour period.