We will have to wait and see if the changes are effective. As recent (and not so recent) global events illustrate, predicting financial trends is a prickly and at best slapshod affair, even for the most preceptive of economists. Even between them there is rarely any consensus on what eventually will happen. And as always, measures taken always will be negatively received and/or experienced by some (even if such measures benefit the majority).
I guess what I'm saying is let's not judge the album before we give it a good few listens.
Perhaps now daytrading can bring in more money than box revenues do. However, as the market matures (that is, when more good players become available) I think however that large stadiums will eventually be able to bring in more. This, in conjuction with the new rules, will make being a daytrader a little trickier.