
What this seems to indicate is that the number of small farms is growing. Actually, most of the hard numbers do seem to bear this out.
There are quite a few online articles about this trend: Hobby farms gaining popularity in Eau Claire County; USDA's latest census shows growing diversity; and U.S. farm growth fueled by small operations -USDA.
If the number of small farms are honestly increasing, that can only mean good things for bio-diversity, local economies and general sustainability.
On the other side, some question whether the USDA's census numbers are correct. This article in The Grist brings a few issues to light.