Never? Like universal suffrage, civil rights, (mostly universal) education, the Montreal Protocol, seatbelts, airbags, anti-lock braking.

Nah, you know what, forget it, give up, shits fucked and people are dumb. /s

Edit to add: unleaded fuel, catalytic converters, emmision standards, one third of owner-occupied homes in Australia have rooftop solar, the widespread acceptance of anthropogenic induced climate drivers.

You're talking about issues solved either through a critical mass of people wanting change or legislation. I'm not saying do nothing.

They're the same thing.

Cristal mass is "if everyone would just".

Legislation largely works because those subject to it largely agree to abide.

If everyone would just agree to stop using the old thing / start doing the new thing.

I'm not following. Everyone agrees that smart (surveillance) TVs suck but nobody is willing to take their money elsewhere. I'm the only person, in my social circle, who cares about this issue. How do we get to a critical mass of people when we are starting from essentially 0?

I think it takes time.

Critical mass is "if enough people would just"

Other stuff, like communism, really requires "if everybody would just". An arbitrarily small number of defectors will make the system tip towards collapse.