[suprjami]

> Imagine some replacement for tcp is proposed

No need to imagine, QUIC exists.

Like every technology since 1980, it's unlikely to supplant Ethernet and TCP/IP, but it's the most successful effort yet.

SCTP also solves the problem of TCP-based DDOS because the client must participate in the handshake.

Good luck convincing all existing network software to switch to these protocols. I would like that too but it won't happen.