Not to be contrary, but why not just use your A/V receiver all the time? It has a volume knob?
Realistically, you have a lot more cabling necessary for the setup you want to do. While HDMI will use certain devices as repeaters, you must have an HDMI input and output to do such a thing which, on a receiver, is only going to work when it is on.
So, instead just run everything HDMI to the receiver, then run the single connection to the TV, then get a decent universal remote. You press one button on the remote and you are watching whatever you want, nice and easy for EVERYONE in the family to use.
We have been using our remote with a receiver for about 4 years now. My wife asked me, about 2 years into it... "Do we have to do something to switch from the TV speakers to the receiver speakers or is it automatic?" My response was that we ALWAYS use the receiver speakers...
She just never turned it up and didn't realize it.
So, you can expect a 10+ year life out of well built audio gear in conjuction with your video setup and the evening news runs just as easily on the surround setup as it does on the cheap internal speakers... Plus, you will actually understand what they say.
Otherwise, you will need to shop for the TV with all the inputs you need and hope that your A/V gear will output over composite/s-video/component at the same time that it outputs HDMI.