well i guess this is fantastic to avoid the argument against eradicating all mosquitos as a whole since they may be part of a food chain or something. It just prevents the disease from transmitting!
Earnest question: what's the bigger ecological change, infecting all these mosquitoes (can they spread it to other species? We've seen evidence of mosquitoes hybridizing in the wild), or just kill them outright?
However currently humanity is killing off a lot of insects without targeting a specific species, so potentially disturbing mosquito based ecosystems doesn't seem terrible in comparison.
The dengue virus is not nearly as important to local ecology, as far as I am aware. Theres such an extreme litany of viruses, most of which have no measurable impact on human existence, that the reduction or even elimination of one species (if that's the right term- pendants I apologise) should be without negative consequence.