It's hard to even characterize the level of impact a case like this could have. For years, the tech industry has understood that the key to success is to control the platform, and then get other developers building on and generating income for your platform. Imagine the sheer number of businesses that may have their business model blown apart by this.
If a company is ruled against on having their own app store on their own OS on their own devices, when they aren't even a monopoly-level player in the larger market, this will blow apart nearly any app store model out there.
I'll, uh, get my popcorn ready.