No, I'm not thinking of the limitations of 5 year old technology. On a 5D4 I've taken photos at ISO 32000, 1/80 sec, f1.2, and it was still too dark.
Give me a camera that has a faster lens or can go to higher ISOs, and I'll make use of them both. As far as I'm concerned there's probably never going to be a point where I'll say "ok, the cameras have high enough ISOs now, I don't need fast lenses." I want to continue to be able to shoot in more and more adverse lighting conditions, and have the camera be able to do it and produce a clean photo. So I want both fast lenses and high ISOs.
And please don't tell me to get a flash. If you're using one in a studio or to get a specific look in your photo that you want, that's fine. But I want my photos to look how the scene really looked without the added light from my flash. In that case the flash would just be a crutch and trying unnaturally to compensate for a camera that isn't capable of capturing whatever scene is in front of me.