5G has extremely low latency, enabling anything that would benefit from that: gaming, telemedicine, low-latency video calls (could potentially allow live music collaboration over video chat, for example)
Definitely 5G is not solving any problem in gaming. I work for a company that builds big fat chips for gaming, streaming is a thing but this is the first time I hear that we need 5G. As for the rest, I am already doing that and all works quite well!
4G already gives you ~30ms latency which is comparable to a DSL connection and just ~15ms above cable/DOCSIS. All of the things you mention are already possible with 4G if it wasn't for data caps.
It will also allow pirates to download 1T of data in 1 min, that's the most important thing