Probably not, since a/v support what the tv is all about (it supports AirTunes).
AirTunes is overrated. It's no good for video.
It isn't supposed to do video. AirTunes is just a relatively inexpensive solution for wireless multiroom music systems.
I see it as a locked audio solution. It is useless to open it with AirFoil for video.
But Apple makes no claims for the AirPort Express to support video. It doesn't even have any video outputs.
Audio from video. You can only use the AirFoil video player, which is no good for TV tuners and web videos.
I wouldn't imagine the market for listening to the audio track of a video that is playing in a different room is that great. You probably need something more specialised for your needs.
There is no dock for the MacBooks. I just want to listen the audio in the same room without having to connect any more wires. A lot of people would also want to do this.
I don't think Apple are going to give you what you want. AirTunes has been around for 5 years and still only officially supports audio from iTunes.
You either need third party software or alternative hardware to met your needs. Have you thought about Bluetooth speaker systems?
I don't think that most people would put a top-end router right next to their AV equipment, esp. when one of the routers features is a 4-port switch.But that's an entirely different product. I mean, they offer AirTunes in their lowest-end router, the AirPort Express. I'd buy that on top of an Extreme before throwing down for an ATV. It just doesn't make sense to me that they would have something like that ONLY on the cheapest model.
I don't think that most people would put a top-end router right next to their AV equipment, esp. when one of the routers features is a 4-port switch.
I wonder how many people have their Internet connection, wired computers, and AV equipment all next to each other?
I'd guess that Apple intended their solution to work like you suggested -- an Extreme running the network, and then Expresses where audio is needed.