as long as the new device will " sleep" it should be good. I like the idea of a TV as a monitor. But my Sony Bravia was long in the tooth and only supported power saving thru the VGA jack. Nowadays HDMI or Display port, supports Power/energy saving modes.
I miss my TV remote control for volume...My BI pc at home is also my daily driver....So yeah,,,as you know, Audio varies wildly in volume from source to source....it's a "nice to have"....