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In 5G, the wider bandwidth will enable broadcaster for broadcasters to deliver high quality audio and video in almost real-time. Below picture shows the example of next gen TV based on ATSC 3.0 and 5G that shows the case of wathcing watching high quality multimedia content in vehicle.
Source: SK Telecom - In-vehicle entertainment based on ATSC 3.0 and 5G in South Korea
In addition, 5G TV can have a power to provide return-path data to Broadcasters - it means Broadcast TV will know what you're watching. In terms of advertiser's point of view, targeted advertising can be implemented by help of that return-path data. Broadcasters Ads specific to your viewing habits and income level could get slotted in by your local station. This is something brand-new for broadcast TV.
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Source: LG U+ 5G Service - Multi view points in Baseball game point broadcasting service in South Korea
Source: Sorenson Media - Dynamic Ads Replacement
Below diagram shows how to combine application with broadcast stream together that is already implemented in common Smart TV on the market that means : the partners can implement all the necessary things easily in HTML5.
Source: https://www.atsc.org/wp-content/uploads/2017/12/A344-2017-Interactive-Content.pdf
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Following diagram shows how ATSC 3.0 AEA(Advanced Emergency informAtion) system enables broadcasters to deliver timely, in-depth emergency related information to their viewers, which can strengthen the connection between the audience and the station and provide critical information in times of need.
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Even though 5G TV technology foundation is already ready, but and network infrastructure is not fully ready. There , however will be no dominant leader who leads that ecosystem as of June 2019. In terms of Broadcaster's point of view, it will be definitely new opportunity can make other revenue source, but it requires some sort of investments - the legacy broadcaster having no investment won't get any benefits on 5G TV ecosystem.
I am curious what we will experience in near future by 5G TV.