Good questions. I will offer my grumpy old opinion as I often do. Some may not like these answers.
What would you keep?
TCP/IP, OSPF, maybe improve BGP security. Those things mostly kinda work OK.
What would you throw away?
This is tricky because if I get rid of all the machine learning dopamine manipulation systems, that will just create a void and new companies will fill that void. I don't have a good answer. FAANG has me at check-mate.
What would you bring back? and What would you like to see more of?
Bits of web 1.0. This is predicated on the previous question and dilemma but all things remaining the same, I would bring back the popularity of self hosted forums and chat servers. Not super useful if people keep using the machine learning dopamine manipulation platforms.
What real world things has the internet replaced that you would like to have back?
More variety of products at local stores. Local stores feel the pressure of Amazon so they have a less diverse selection of products.
What real world things would you like to see cyber-ized?
Nothing more. There are already too many silly IoT's and too much intrusion into peoples lives. People are already physically unwell and the internet is making people psychologically unwell too. Augmented Reality is very likely to cause traffic accidents and drama IRL.
Are you generally optimistic or pessimistic about the future of the internet?
I am optipessimistic. There is always tomorrow but some new scammy fad-like shiny object will find its way into peoples lives. I claim the NFT rights to my reply. /s
That is probably a negative sounding answer but that is the best I can do.