The killer part of the app is that it offers the ability to bet online and get quick gratification. Draftmix hits the action player's sweet spot, and I suspect apps in this area will drastically outperform their season-long counterparts. Anyone familiar with gambling economics knows that the action players and casual gamers drive the economy.
The argument about skill vs. chance in the comments of the TechCrunch article is interesting. I think it's easy to make a compelling argument that success in the short term format might require more skill than season long formats, but legislators have demonstrated that compelling arguments hold less value than one might think they should.