As far as the character sheet, I only have the revised PDF, not the original. The character sheet that is in this PDF (as well as the wound track in the section detailing damage) does not have a check box for Wounded or Dazed. Instead, it is an empty space like for Hurt and Bruised, which implies visually that multiple Wounded/Dazed conditions are possible.
As far as the verbiage goes, once again I only have the revised PDF. The verbiage that you have quoted does indeed make it clear that only one Wounded condition is possible...until you turn the page and read the descriptions of Wounded on the following two pages. One description states something to the effect of the -2 penalty remaining until ALL wounded conditions are eliminated. The next description states that the character receives a -1 penalty to toughness saves for EACH wounded condition.
Also, you are correct that we are reading a lot into Steve's short response.
As far as personal opinion goes, I am in favor of my interpretation for the following reasons:
First, the "death by a thousand cuts" example that you gave. This makes for longer "major" battles (the Minion Rule already does enough to shorten "minor" battles).
Second, it helps PC survival by slowing the "death spiral" (once again, the Minion Rule takes care of the fodder).
Third, this is what I believe the intent was supposed to be. What I mean by that is that I believe the text regarding taking a second Wound and becoming Disabled was in error and will be fixed for the next revision (print or pdf).
Now, why an official comment has not been made yet leads to the following theories
a) Steve is not able to actively monitor the boards at this time
b) Steve is too busy currently and this is not a priority yet
c) Steve is waiting to see what the popular opinion is and will adjust the verbiage to meet fan expectations