Hey James,
Interesting direction on USB-A. I've seen other products like this from companies such as Musical Fidelity with their V-DAC and M1 product lines. What I've seen them do is not only offer the USB convertor as a separate component, for those that need it but also integrate the technology in their standalone DAC e.g. M1-DAC A, where "A" stands for asynchronus USB.
Are you considering offering an update to the BDA-1, say the BDA-1 "A" that will have the a-USB integrated? Given where competitors are going with their latest updates to DAC models - it may make sense to integrate this technology (if possible) within an updated version of the BDA-1, while still offering it as a stand-alone for those who already own a BDA or perhaps those who own a competitors DAC product and want what Bryston can offer in a USB convertor.