This paper reports initial findings on the apparent loss of passive voice constructions in Moundridge Schweitzer German, a moribund enclave dialect spoken in South Central Kansas. The dialect once had three agent-suppressing constructions; today speakers produce only an impersonal construction but marginally recognize one passive construction in comprehension tasks. Comparative and internal evidence suggests a clear path for this development qua syntactic extension. Empirically, numerous heritage and moribund languages lose passive constructions, and our account appears extendable to those settings in ways that illuminate some claims about heritage language syntax. The synchronic outcomes are easily modeled using the notion of syntactic neutralization, and it is argued that a neutralization approach to syntactic ineffability has significant advantages over a NULL PARSE approach. Since the latter is Optimality Theory (OT)-specific, the paper models its findings in OT. Because neutralization is a framework-independent concept, the findings have broader ramifications.