Only about 20 years too late.
Perhaps they could publish it as an informational RFC - it's usually the fate of reasonable ideas that have hit a roadblock.
Mind you, the reason that IPv6 addresses are a fixed 128 bits long is not unconnected to the influence Sun had in the IETF at that point and the perceived advantages SPARC would have in handling them. There have always been vested interests and it isn't just cisco. And it isn't just the IETF - ISO standards groups are as bad, or worse.