On Wed, 13 May 2020 17:00:14 -0400, Jon Lewis said:
When you've convinced Cisco, Juniper, Arista, and a few other router vendors to implement, and have submitted patches for the Linux kernel and userspace to implement IPv4+ (good luck with all that...and expect to be met with "Can we have some of what you've been smoking?"), then you can start pushing your next gen IP concepts. Until then, it's a total non-starter.
At least when Dave Taht was pushing his "make the class E space usable", he had patches and testing for multiple systems. Turns out that not many systems check for 'first octet >= 240', but actually test for the class D space and using class E Just Works an amazing percent of the time.... (Yes, I was surprised myself, but deploying it is still very much in the "effort better spent deploying IPv6" territory...)