I agree.
People who already own 5.1, and especially 7.1/9.1 are a lot more likely to upgrade to ATMOS than everyone else.
People who own dedicated HT rooms are more likely to upgrade to Atmos than people who have HT in their living rooms or upstair bonus rooms.
Like Gene says in his review, up-firing speakers make little sense playing billiards with sound.
The salient thing about the current Atmos setup is having speakers
ABOVE you firing down so that you can hear
CLEARLY (not overpowered by all the other speakers). Most of the Atmos sounds are rain/thunder from above, planes/helicopters from above, intercom/voices from above, tunnels/caves/roofs from above.
Good speakers can image well. Look at 2Ch music. Speakers can image the vocals dead center even when the 2 speakers are 10 FT apart. It sounds like there is a center speaker. That's great imaging from 2 speakers.
It's the same way with ceiling speakers. 2 ceiling speakers are capable of imaging well. Thus, they can image and pan every well.
I have 5.1.4. But when I change to 5.1.2, I notice that I still get extremely good panning and imaging.
The salient thing is to make sure you get good volume level from the 2 overhead ceiling speakers so that they are not "overpowered" by the other 5.1 speakers/subs.
Having 4 ceiling speakers are better, especially if your ceiling speakers can't image/pan as well. Not all ceiling speakers are created equal.
But if your ceiling speakers can image/pan extremely well, 2 ceiling speakers will sound great.
As for 7.1/9.1 vs 5.1.2, it is truly
NIGHT/DAY difference! There is no way you can get Atmos sounds of rain/thunder from above, planes/helicopters from above, intercom/voices from above, tunnels/caves/roofs from above from the 9.1 speakers on the
GROUND. It is a night and day difference. No virtual speakers or imaging capability of any speakers can reproduce these sounds from
ABOVE.
It is definitely a FIRST WORLD problem.
It costs more money and it is difficult for most people to install ceiling speakers.
But ceiling speakers don't have to be traditional ceiling-flush-mount speakers. If they could "raise" the rear bookshelf speakers from "ground" level all the way up to the ceiling level and point those speakers down directly at them, they could get the Atmos overhead effects. Again, the salient thing is to have speakers above you pointing down directly at you. They make inexpensive wire covers that you can paint over to nicely conceal the small speaker wires going up the rear corners of the room. There are ways to camouflage those little speaker wires.
PL-II should not even be used in the same book as DSU, much less ATMOS.
DSU (which you could only get with an ATMOS AVR or Pre-pro) is 100% better than PL II. That alone is night and day.
As I've said before, when you've heard extremely convincing overhead effects of Atmos from overhead speakers that can NEVER be reproduced with even a million ground-level speakers, you will see that it can be night and day difference.
Think about that. You could put a $1,000,000 worth of speakers on the
GROUND level and they would never produce the
OVERHEAD effects from ATMOS.