Port numbers will stay, because SCTP defines them. If you want to get rid of port numbers, you will need to roll a new protocol, and nobody will go this way me

Port numbers will stay, because SCTP defines them. If you want to get rid of port numbers, you will need to roll a new protocol, and nobody will go this way merely because of four bytes per packet. Also, there would probably be vast amount of unexpected traps and pitholes without port numbers. We already know well how to work with port numbers. We don't know too well how to work without them.