More than that, a ruling against Apple here would have huge implications for any company running an app store on their device. Smart TV manufacturers, companies like Roku, Automobile manufacturers, etc... If you can be considered a monopolist because you control your platform then there will be a LOT of monopolies out there.
I'm not expecting Epic to get any real traction on this suit. The best they can hope for is Apple working out some system where they'll reduce their cut in certain circumstances, but given how unlikely this case is to go anywhere I don't think Apple is feeling any pressure.