IPv6, needed for modern Internet not to collapse, would make many other important things easier. Easier to become an ISP, to selfhost, to build P2P networks, etc.
I really hope matrix gets native VoIP. I saw like 2 years ago it was in beta, haven't kept up with it though. I'd also really like voice channels like discord so my friends and I can replace discord but it seems like matrix isn't interested in being a discord replacement