1. I don't think Ilya is equivalent to Carmack in this case — he's been focused on safety and alignment research, not building GPT-[n]. By most accounts Greg Brockman, who quit in disgust over the move, was more impactful than Ilya in recent years, as well as the senior researchers who quit yesterday.
2. I think you are underselling what happened with id: while they didn't blow up as fantastically as Ion Storm (Romero's subsequent company), they slowly faded in prominence, and while graphically advanced, their games no longer represented the pinnacles of innovation that early Carmack+Romero id games represented. They eventually got bought out by Zenimax. Carmack alone was much better than Romero alone, but seemingly not as good as the two combined.
3. I don't think Sam Altman is equivalent to John Romero; Romero's biggest issue at Ion Storm was struggling to ship anything instead of endlessly spinning his wheels chasing perfection — for example, the endless Daikatana delays and rewrites. Ilya's primary issue with Altman was he was shipping too fast, not that he was unable to motivate and push his teams to ship impressive products quickly.
I hope Sam and Greg start a new foundational AI company, and if they do, I am extremely excited to see what they ship. TBH, much more excited than I am currently by OpenAI under a more alignment-and-regulation regime that Ilya and Helen seems to want.