Idea: getting rid of the input button on TVs

I had a thought: the input select button is unnecessary. If they could make it so that devices send an "attention signal" to your TV via HDMI when you commit an action, then have the TV automatically switch to that input. We already have a similar behavior; when we hit the channel button while on an input source it switches back to "TV". So it wouldn't be too much to ask if I hit "play" or do any action on an HDMI-connected device, to have the input switch on its own. Just an idea...