Depends on the battery life of the remote. Most people wouldn't be too happy if they were changing their batteries every few weeks because they watched a few movies with headphones.
Seriously. I have a smart TV, but I might buy this just for the remote headphones. Nice wireless headphones are at least as expensive as a roku box, but I already have nice wired headphones.
Would love this feature on a standard universal remote.
The problem is that the standard universal remote has one-way communication with the devices it controls. The Roku remote uses bluetooth to control the Roku, so adding audio was no big deal.
The Roku 3 remote uses Wi-Fi Direct instead of bluetooth.
Would love a smart tv that has the capability to send sound to my phone.