The really sad thing about this though is that "the internet" no longer works for stuff which isn't TCP. I guess it does, but not for your whole target market.
The lowest common denominator is users behind an NTLM proxy. Mass market products don't generally work unless they have a fallback which is "I can make it tunnel through proxies". Which is HTTP or CONNECT :( Which means no teams will do something which isn't TCP anymore, since it's not a thing they can tunnel :( Interested in counterexamples though.
This is the same reason why a UDP replacement is a great idea but a waste of time for most people developing a product. This makes me sad.
You have it the wrong way around. People who cordon themselves off and only leave HTTP working aren't on the Internet.
They don't want non-web apps to work. Those networks deliberately rule out networked games, uTP, VoIP, IPsec, WebRTC, etc.
If you want to worry about people teetering on the edge of the Internet, you should worry about people behind NAT and its prevalence to the point of people confusing NAT boxes and routers...
(Re your last sentence, it's not a UDP replacement, see other comments.)
The lowest common denominator is users behind an NTLM proxy. Mass market products don't generally work unless they have a fallback which is "I can make it tunnel through proxies". Which is HTTP or CONNECT :( Which means no teams will do something which isn't TCP anymore, since it's not a thing they can tunnel :( Interested in counterexamples though.
This is the same reason why a UDP replacement is a great idea but a waste of time for most people developing a product. This makes me sad.