In a lambic the dominant organisms are the lacto, bret, and pedio bugs. Acetobacter should be a very minor player if it is even in there at all. I do have a lambic brewing myself. The only bug I am afraid of getting into the rest of the brewery is literally a bug.....the common fruit fly, the most notorious carrier of acetobacter. I certainly don't want 50 or 60 gallons of vinegar. In a lambic, I would guess that the other organisms have created an inhospitable environment, but I am not sure what that condition would be.
Bugeater Brewing Company