alt Hacker News> Realistically nobody outside some devoted HN readers are going to self host their own content.
How about Xbox/PS multiplayer/P2P gaming? Hosting a Minecraft server?
When Skype first came out it was P2P, but had to come up with the "supernode" concept (basically STUN/TURN/ICE) because of NAT: now all of our communication methods basically have to phone into the mothership.
Do we want the Internet to be more centralized (possibly given more power to the tech bros) or more decentralized?
Would you give your personal phone number to random strangers on the internet, or even publish it on a website? Probably not, due to the possibility of harassment, right? IP addresses aren't any different, which immediately kills a huge portion of the game server self-hosting.
A hosted and managed Minecraft server is available for less than the cost of a cup of coffee per month. At that price point it makes very little sense to deal with the hassle of having to run your own home server. Even if you want to geek out and manage it yourself, a VPS is a very attractive option.
And for the handful of people that remain and really want to homelab a Minecraft server for their friends but are stuck behind CGNAT, there's always software like Hamach - which solved the gaming NAT problem back in 2004.
So no, self hosting isn't a problem which needs IPv6 to solve it.