Being that one of my friends cannot see red, and complains about this kind of thing in videogames all the time, I agree with the change.

However, as someone who has been playing this game and dodging red circles for nearly 6 months now, these new markers do feel weird to me. Maybe it's the yellow color or the fancy animated effect, but the "danger" flag doesn't go off as well in my brain now. For the first time in a long time, I find I have to consciously think to move out of the way, rather than do it by reflex.