Something disappearing doesn't literally mean there'll be none of them -- there are still literally hundreds of drive-in cinemas in America and yet we'd all agree those have "disappeared". They're a quaint, bizarre artifact of the past. Malls are not quite as endangered, but are getting there. A recent analysis suggests there are about 1,100 malls in America, and about 350 of them are in imminent danger of being in a death spiral or closing altogether. That's not a number that's going to be magically reversed.
In terms of conventional cinemas, I think they've been hurt by several things. The exclusivity window for theatrical films versus VOD, including free VOD, is getting shorter and shorter. My guess would be that cinemas are selling fewer, more expensive tickets than they did 10 years ago, and that will not be sustainable indefinitely. Recent news reports suggest that both Comcast and Netflix are negotiating a plan to have people be able to rent movies currently in theatre for $30-50 and for a family of 2-3 this is often going to be a better option than going to a theatre. Obviously the experience in terms of sticky floors and cell phones is pretty miserable at this point. Most of the growth in film distribution recently has been VOD services like Amazon and Netflix and while they aren't going to make $250 million garbage superhero trash or Transformers, they're buying up a lot of the $5-25 million budget range and they aren't really required to see cinemas as allies. It looks like the academy awards will likely drop their "the movie must have theatrical distribution" requirement over the next few years -- and while this really only impacts some very low budget prestige films, it's another sign of the times. And yes, the collapse of malls is going to hurt cinemas too.
I think if you fast forward to, say, 2030, there are likely to be fewer theatre screens, fewer new release films in theatres, fewer people buying tickets. I think super-premium experiences are likely to be somewhat more isolated from this, but that they will suffer as well.
Hyperbole probably causes deniers to push back more forcefully than they should. I think cinemas face structural challenges that they will ultimately not overcome. Exactly how fast that will happen I'm not sure. But that's okay. Even if you like going to the cinema, there's no need to be worried that your grandkids won't have an experience you had just like it's not important that you have lived through using an outhouse or riding in a horse and buggy or war rationing or playing jacks or marbles. Like, it's OK.