I believe that the serving size/fact label for wine makes no sense. As WI stated, Americans pay it no attention. Furthermore, as wine is not a food, but an alcoholic beverage that is regulated and taxed as such, a serving fact portion on the label becomes less relevant.
I agree with the unreasonable burden of cost on small wine producers, both domestic and imported, with no apparent benefit to consumers or the producers.
Finally, it is my opinion that this effort is being pushed by the anti-alcohol "lobby" (for lack of a better word) with the end to harass the industry. It will result in fewer choices for the consumer, and raise prices. And going down the anti-alcoholic beverage road has a long and sordid history in the US, if anyone remembers.