You are definitely onto something huge here [1]: you could be improving the livelihood of millions with an app to allow people to fill in on temp jobs at competitive wages with the click of a button. Talk of a massive impact...
The road ahead is steep, though. At first I thought Leah's TaskRabbit would eventually head that way, but to me it strikes me as if she's still massively underestimating the potential of her platform. Justin Kan's Exec and its postmortem doesn't bode too well, either (but it's still an insightful read) [2]. I'm pretty sure though you and AB have what it takes to figure it all out.
[1] http://www.propublica.org/article/the-expendables-how-the-te...