A Colombian poet called Gonzalo Arano wrote the first nadaist manifesto in 1958. "Midnight. I get down the ceiling through a staircase. There's a nice full moon. I get dressed. I go out to the streets. After a few steps I have this reassuring feeling: today I haven't done anything". (http://www.gonzaloarango.com/). However, as most artists, the author gets extremely pessimistic in his "pious progress to madness and suicide".
As for me, no endurance path makes sense at all.
Besides, there's a Austrian female artist called Nada Hribernik-Godler who wrote a book called ¨Nadaism: philosophies of life and art". In her own summary: "Innerspace is filled with images of splendor as words fulfil the promise of thought and inspiration in this offering of a personal philosophy". Seems to address some paranormal subjects and also supposed to be a "nice coffee table book for any artist". (??).
Also, there's some British musicians and DJs who call themselves nadaists, @ www.nadaism.co.uk.
In total, there are around 2000 entries for "nadaism" in google, and about 10000 for "nadaismo" (since it seems the unknown Colombian poet had certain influence; some critics compare the movement he started with the Beat Generation).
As for the ideology, it is true that nadaism might have some roots on existentialism, and shares some of its mistakes. Is life worth to be lived? - that's a question you cannot rationalize, nobody would commit suicide so coldly after facing an intellectual deadlock, (except maybe some artists).
A friend suggested me that "La Salle de Bain", by Jean-Philippe Toussaint, is still his nadaist bible, "showing the way, but also showing the futilility of it all as in the end he renounces and returns to the struggle of life". From the novel: "Lorsque j'ai commencé à passer mes après-midi dans la salle de bain, je ne comptais pas m'y installer ; non, je coulais là des heures agréables, méditant dans la baignoire avec le sentiment de pertinence miraculeuse que procure la pensée qu'il n'est nul besoin d'exprimer". (I should translate it I guess; you can copy-paste e.g. in www.worldlingo.com, the result is readable, more or less).
And finally, some could even find plagio in nadaism from Eastern thinkers like Krishnamurti. There's plenty of authors trying to go deep into the uselessness of thinking, suggesting that we should spend more time being present in our lifes. But they write very long books about it, in order to encourage you to think about it...