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.
GNU Taler, a payment protocol just look at it go: 101010.pl/, or just imagine building a payment terminal of a Raspberry Pi
Matrix, to unify chat, conference and calling apps
some self-arranging darknet protocol becoming a norm like I2P, GNUNet or Yggdrasil, so we could have a backup when mass Internet blockage happen