Most people among both ideologies have long believed in the arrival of a machine demigod of sorts, but I kind of am skeptical of the notion that there are any tech people who have not always held similar beliefs in the long run. Like, all the people reading this: you think in a thousand years from now humans are going to be doing most labor? Obviously far, far, far smarter machines will have unimaginably changed things by then, and/or we'll all be gone.
The difference is most people in tech have historically thought it's maybe a century or three away, while the rationalists think it's a decade or two away (and also thought it would be 2020s - 2040s even decades prior to now).