First things first: I never contributed to GNUstep, and I probably never will: for 30 years I've been developping and analyzing IBM-mainframe applications with exotic tools like Cobol, IMS, DB2, Rexx, JCL, so I do feel slightly uncomfortable in the PC-environment, as the prverbial Englishman in New York. But I ave this weird genetic predisposition that makes me like things like Smalltalk, NextStep, Objective-C, so I regularly keep coming back to this mailing list. So if your answer to a mail starts with 'Show me your contributions', you can just stop reading, and please accept my apologies for taking your time....
I like the idea: make objective c great again, as I fear that after Swift, Objective-C will remain as it is, frozen on version 2.0, and then completely be forgotten. And I think that's a pity, because the combination of Smalltalk and C just seems to make sense to me. High level if you can (Smalltalk), but low-level (C) when needed.
So what I would have liked to see at the mulle-objc website are some ideas and plans for the future evolution of Objective-C. Instead, I see the announcement of a runtime that currently seems to do no better than the current, working and tested, Etoile-Runtime, also based on Clang-LLVM, if I'm not mistaken. So I wonder, if there was no way to cooperate with the creators of the Etoile runtime, or is this runtime fundamentally flawed and beyond repair.
Imagine if, after some careful thought about possible improvements of objective-c, that coding effort would have been spend on improving and extending, instead of just recreating.