It's a nice thought, but I don't think it'll allow us to flash new firmware. We can already flash firmware on Intel chips, but the firmware has to be signed using Intels keys. The signing verification still happens on the mask rom which is impossible to overwrite.

Maybe this discovery will help us understand more how the verification step works. But I think the best we can hope for is a way of overwriting Intel ME very quickly after it's booted every time.