Your last sentence is exactly why I have posted the question. With only an 8' high ceiling and surround speakers that are both direct radiating and dipole, you would be surprised to hear that sounds are pinpointed and do not always sound like they are coming from above. For example: As a helicopter of plane passes from front to back, the sound progression is seamless, but if I want to hear the sound of the aircraft hovering directly overhead of my seating position, how can I achieve it with the system I have now. There will be many people like myself who have invested thousands of dollars on their surround system, and have designed their room in such a way where it is impractical to alter the original design. Also, my existing speakers are only 3 years old, which make them relatively new.
A practical solution for many people will be to have Dolby Atmos controlled strictly through the electronics whereby they can employ any compatible passive speaker either ceiling mounted or firing up towards the ceiling. The initial crop of Dolby Atmos enabled speakers are nowhere near the class of speakers that I have in my system. I could see adding some Paradigm Studio/Reference satellite speakers angled up at the ceiling for my specific case.