There are always complex consequences, but note that Aedes aegypti is human-introduced in Australia to start with. It's an intrusive species, it may be safe to eradicate.
Yep, same in Fresno. Honestly in most places, they're only able to survive because of humans and people who over water their lawn specifically. The climate in these places are generically not made for that specie. It's also worth noting that there are many other types of musquito around so they're not wiping out all musquito, just that one specie which consist of a small fraction of all musquitos