As people are getting more atomized they interact with fewer people. This is why I think step-whatever and teacher stuff is so popular right now, the idea of meeting new people is getting increasingly alien to a subset of the population.
That subset is also very invested in any way to distract themselves and escape that existence, hence why there is so much media catered to them.
Its been an anime trope for a LONG time though. Like over twenty years
I can tell that I'm starting to get old when I think of 20 year old anime as fairly recent. But alienation and atomization didn't begin in the last 5 years, it has been a long process.
You can also tell the way that things are starting to turn less grand on possibilities. The recent glut of isekai anime is a perfect example as you would have isekai before, but now they tend to all be based on online games. That is where viewers can imagine themselves in the shoes of the protagonist.
