This would certainly be a differentiating feature that Canon would be able to pull over everyone else for a long time. However, for myself, I do not see the need. I never suffer the lack of ISO(I do animals) and more just sometimes miss focus by a few mm on occasion.
This is not boosting ISO, its increasing DR, even at ISO 100.
For myself, I definitely find cases where DR is totally inadequate. I'm not sure if this would fix those cases, but any help is good. I'd put this to the test right away. I've just been editing 2,000 shots from a theater event. Generally, the stage is not brightly lit, then, they hit a subject with white clothing with a spot while the rest of the stage is dim, it results in a exposure nightmare. Or, there is a light in a scene, perhaps a streetlight which blows out without dropping the exposure drastically on the fly. Then, in post, there is always more noise than desirable for those shots.
I toss far more images due to exposure issues than I do with poorly focused images. The DR of my 5D MK IV and my EOS R is very good, but is still not able to capture a significant percentage of my shots unless I underexpose. Sometimes, I set EC to -2 or even more.