IPV6 can make some things worse, especially spam.
For example, it makes banning or classifying an IP address as a spam source nearly impossible. There's so much address space that spammers will be able to use an IP to send 1000 emails and then discard it, never to be used again. The incredibly huge address space makes this quite practical. Banning by IP address will become meaningless because there are so many useable (and therefore discardable) IPs.
How much address space is there? Well....
Let's assume every single one of the 100 billion stars in the galaxy is inhabited, and each star has a population of 10 trillion humans in orbit around it, and each human has 1 billion devices that need IP addresses.
In that case, only 1/340,282nd of the possible 128-bit IPv6 addresses would need to be assigned.
Put another way, IPv6 would (will) provide roughly 5,000 assignable IP addresses for every square micron of the Earth's surface.
Hell, they could use one IP address per spam and never run out of fresh IPs in our lifetime.