The atheist PZ Myers says organized atheism has "imploded".

 On July 6, 2021 the atheist PZ Myers wrote:  

Even before organized atheism imploded, “New Atheist” confused everyone — it wasn’t “new” after all, and it was only defined by listing a small group of people who were somehow representative. 

For details see: July 2, 2011: The day the atheism movement died on the information superhighway

 See also: An additional sign the atheist movement has imploded. Reddit post: "Why is everyone mocking atheism all of a sudden?"

Atheist PZ Myers says atheism has fizzled out

The atheist PZ Myers indicates in a September 29, 2021 blog post entitled Maybe it was the infusion of Pinkerism that helped atheism fizzle out says the atheist movement is "fading out". 

In 2018, the atheist Myers quoted an atheist activist who declared: "It’s quite depressing that movement Atheism has turned into such a joke. I valued it so much once." In addition, Myers said in 2018 that the atheist movement is in "shambles" and this is "quite depressing" for him.

Professor Eric Kaufman, who teaches at Birbeck College, University of London, specializes in the academic area of how demographic changes affect religion/irreligion and politics. Kaufmann is an agnostic. 

On December 23, 2012, Kaufmann wrote:

I argue that 97% of the world's population growth is taking place in the developing world, where 95% of people are religious.

On the other hand, the secular West and East Asia has very low fertility and a rapidly aging population... In the coming decades, the developed world's demand for workers to pay its pensions and work in its service sector will soar alongside the booming supply of young people in the third world. Ergo, we can expect significant immigration to the secular West which will import religious revival on the back of ethnic change. In addition, those with religious beliefs tend to have higher birth rates than the secular population, with fundamentalists having far larger families. The epicentre of these trends will be in immigration gateway cities like New York (a third white), Amsterdam (half Dutch), Los Angeles (28% white), and London, 45% white British.

In 2010, Kaufmann wrote: 

Worldwide, the march of religion can probably only be reversed by a renewed, self-aware secularism. Today, it appears exhausted and lacking in confidence... Secularism's greatest triumphs owe less to science than to popular social movements like nationalism, socialism and 1960s anarchist-liberalism. Ironically, secularism's demographic deficit means that it will probably only succeed in the twenty-first century if it can create a secular form of 'religious' enthusiasm.