You point is valid to a degree. Just because I say "street photographers want redundancy as well" - I suppose for me, that is generally how i refer to the way I use my camera.
truth be told, I enjoy cycling (love Suffolk and north Essex) and always carry a camera with me, because some on the views are stunning. On such trips I also carry a very compact tripod with cable release and a Lee Filter kit for those moments you want to record or images you want to create.
With such trips - it would be nice to have that redundancy, because often the views will not repeat themselves in a hurry, and having that extra card covers the various issues that can go awry whilst out cycling.
Through all my digital photography, the only 2 things I've never had the pleasure of a decent A/F and dual memory card for redundancy. I have had a couple of card failures, hence my desire, and I've always used either Canon 5D2's (crap A/F) or the X-Pro 1 (A/F good under certain conditions).
The X100T has certainly given me what I desire (or at least a huge improvement) with A/F - so it only leaves me to wish for a dual memory card slot.
As people come to appreciate the importance of digital dat, I suspect many more will also desire dal memory card facilities as well. Easier than trying to hook up to cloud data via a smart phone - for now.