lightbox didn't they say all that stuff when we went from AM to FM? No one is going to invest in 2 speakers when you only need one.
I have 8 speakers in my car now. LOL. My wife's car came with 8 speakers from the factory. All we need is a Surround Sound toggle switch. Ha!
1. Where has 3D movies or 3D TV gone? It was a short hype and now it's pretty much gone.
2. Going from mono to stereo was relatively easy, just one more speaker, a second amplifier and done. From stereo to full blown Atmos is a different beast ... going from 2 speakers in front of you to 12 speakers all around you ... and don't forget the 12 amplifiers to drive these speakers, plus all the cables, stands, wall/ceiling mounts or in case of active speakers 12 times power supply cables everywhere.
3. All these soundbars on the market try to reduce the complexity of a decent setup so the average Joe can handle it ... but I tend to call this "fake Atmos surround" using heaps of psychoacoustic trickery. I doubt we would have to do full-blown Atmos productions to achieve that.
Either way, the main problem is that we all can produce AND deliver stereo content in pretty much every way we want ... from vinyl to CD, DVD, BluRay, pendrive ... we can even use it in videos or selfmade livestreams, or send the files to friends or clients and everyone can listen the way they want.
With Dolby Atmos you're very limited to distribution on some streaming platforms, with VERY little (and widely unknown) exceptions.
As a simple example ... you want to produce a song that is not intended for publishing on streaming platforms, it's just for family and friends or maybe just for yourself. You'll have a hard time with Atmos while stereo is easy.