My personal opinion is this is unlikely to work and that the reason iPad lacks a “killer app” is largely because the app ecosystem is too dysfunctional for one to emerge organically from third party ecosystems. Because the iPad is a more powerful platform than iPhone, and (especially) because people’s “session times” tend to be longer on iPad vs iPhone, you need to invest more to make a good iPad app. On the iPhone it’s enough to save people a little time vs the web and connect them more readily to a service while mobile (Uber, Instagram, Amazon, etc)
iPad offers the chance to do something much deeper. But there is so much more risk — will people pay higher prices (App Store price expectations are lower than desktop), will Apple approve the app, will it get noticed in the store amid all the crap. Are the APIs powerful enough to make what you want to make. Etc.