160 bit hash in addresses provides enough security, and that's the important part.
Right now it does. But not eventually. Quantum computer can reduce that to 80 bits.
Quantum computers cannot reduce anything. Quantum computers are just a scam hidden behind weird probabilistic equations, which are very conveniently excluding almost all real life noise. Quantum computers are so weak, that cannot factor a 6-bit number using the almighty Shor's algorithm - which "breaks ECDLP" - the number 35 turned out just too big for reliable factorization.