Are you just talking about how you write the addresses or are you talking about the actual protocol?

The IPv4 protocol has 4 octets each for source and destination address. Period. If you change that, your packets won't work on any IPv4 routers or software any more.

If you want to write IPv6 addresses as numbers separated by dots no one's stopping you but I don't see how it's better. They switched to hex because the old format was too long.