Does roku plan to come up with a streaming system for the whole house so you only have to do app setups once instead of with each device?
Not that I've heard.
In the early days of Roku, their income was largely from the sale of devices, so that would have seemed unlikely back then. But now, they are targeting income from advertising sales and subscription brokering, so this approach could be more attractive to them now than in the past.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T