First let me say that I'm not 100% on all of this, but...
I believe it would require the cancellation of your current service, then signing up for a residential plan. With this said, there are some possible drawbacks to doing this. First, if your current service is less than twenty four months old, it would likely be subject to an early termination fee, and depending on how long you've had it, the fee could be significant. Second, there's no guarantee that the residential plan would be any different, service wise. In fact, business plans tend to give better service than residential plans, though this isn't always the case. If I remember correctly, the equipment for the business plans is slightly different, with the dish being slightly larger and the radio being more powerful, with the aim being better reliability. And third, and again having to do with the very real possibility of the residential plan not being any better, you'd be in a new 24 month commitment, meaning that if you didn't like it and wanted to go back to a business plan, you'd again be subject to an early termination fee to cancel the residential and then sign back up for business.
Also, if you currently have Gen 5, the residential service you'd likely have to go with would be the new Gen 6.
Your best bet would be to call and ask. It's 866-347-3292. If you need to call another number for business account support, they'll be able to give you that number.
Something to keep in mind is that speed during prime time hours tends to be lower than off prime hours. So, even with a residential plan you're still likely to see your speed dipping in the evenings, which may affect your ability to stream well. How well a subscriber is able to stream can vary from location to location. One of the biggest impacters on streaming is latency, and with geostationary satellite internet there's no getting around it. It will always be around 600ms or so. When that high latency is combined with system congestion, which again is most prominent in the evenings, things like streaming can suffer. It's one of the drawbacks of this kind of internet, unfortunately.
Lastly, they DO have Fusion plans that couple with service from a cell tower, giving lower latency for some activities, and service like that may be better for streaming. The catch is that you need to be in a location that can actually get a decent cell signal, so Fusion plans aren't available to everyone.