Do I like hi fi or high definition music? Absolutely.  I do not want to go back to quite limited frequency response.  Then again, high dynamic range in vision to me is best when it approaches that which I actually see.  Honestly, to take any printed or projected image and compare it to actual vision is very, very difficult. Many other factors are at work at the time we "see somehting" which are not present in even the best hdr images.

As with music, it can be over done depending on tastes.  When the image is rendered in a grarish manner..forget it for me.  When it is excellent hdr, I will not honestly know how the image was processed except that it is excellent to my view.    Rich has said a lot.

 

And, Lynell is right...there is certainly time to "go beyond" and see what can be done. To know what is too much would imply knowing what is enough, well, maybe not.