I would shop other brands if the AVC box is not an option. I understand the logistical problems of different factories -- if they decide to put a ton of connections on the back of the panel, you should at least have one connection for the AVC box and sell it as a seperate product -- if there are delays with the box, it won't impact shipment of the set.
Sort of like buying a port replicator with a laptop. People that want one can purchase one seperately -- people that don't want one don't have to. You could even sell multiple versions of the box -- a high end one with more DVI connections, or DVR functionality, etc.
It was mentioned elsewhere on this forum that AVC boxes are rarely upgraded. But as a seperate option, they might have a different life cycle than the display. A new box comes out, so you buy a new one to use with your current display, or keep your old box and buy a larger display, etc.