What an elegant solution to malaria problem. My only fear is that mosquitoes will adapt to this minor change.
Not that it takes away from your concern, which is valid. It is possible that ubiquitous deployment of this device could select for more resilient phenotypes on human-observable timelines (See: https://en.wikipedia.org/wiki/Peppered_moth_evolution)
The goal, after all, is to wipe out malaria — not necessarily to wipe out mosquitos.