which is moot because lack of digital video output rules out for uses requiring displays
What do you mean? It has DVI (which means it will also support HDMI via an adaptor).
and high power consumption rules out for basic home servers.
High? 35W using a non-optimal PSU hardly seems high. Is it the best possible, no, but we are talking only about a 5W difference. Still for a file server, one of the 945G based Atom board would be better just because of base price. Any energy savings would just be icing on the cake.
I think the point of this board is for people who want to make very simple, tiny, general purpose computer. They need a little bit more horsepower than an Atom, but nothing else. The normal case wouldn't be to pair this with an E7200, but with a Celeron. This is the first affordable offering for this application in this form factor. The question is how big a market is this?