I recommend you ask the
blue iris developer directly if you want a tvOS app, so he can gauge the interest. He'll probably never see this thread.
http://blueirissoftware.com/contact/
I wouldn't count on it happening soon though, if at all. tvOS is not likely to be nearly as popular as iOS.
It seems the apple TV doesn't have a web browser, and in fact Apple doesn't even allow developers to include web views in their apps. So a browser-based solution is not likely either. The best bet is probably for IP cam viewer to make it onto there, or any other generic IP cam viewing app. Then you could at least point it at streams from the Blue Iris web server.