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Why? IPv6 enabled the address range. In the TCP space alternatives exists (UDP/Quick). I do not believe TCP will be replaced.

The only thing which surely will be replaced are the routing exchange protocols like BGP with all the shenanigans happening there.

If you believe in space colonialism then there will be some kind of message oriented layer on top to deal with the latencies (think universal SMTP or something).

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There's a lot of limitations within those protocols that just make things unnecessarily difficult and limit functionality. Port numbers and the lack of logical service names, lack of routing across disparate unroutable routes, lack of carrying forward/back diagnosis of network segments, etc. HTTP as an additional transport protocol is a shitty hack that people use to work around some of those issues but more remain.

Makes all sense but not enough to migrate away from TCP. Half of the things can be also solved by higher level services (and lower than HTTP).

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