Hah I didn't know what it was, I'm reading the article on wiki right now and yea it's pretty much what I'm saying.
It's pretty much the logical conclusion to the despair brought on by the loss of god.
i.e. god = meaning to life: Life = test for the after life.
No god = no meaning to life: life ends the same irrespective of how its lead = nihilism.
But Nihilism + innate desire to live and survive irrespective of how illogical it is = make the best of life while you live = existentialism.
Existentialism is the logical end of our innate desire to strive, to survive, to live despite the senselessness of life itself. To make the best life we can, because you might as well while you're granted the opportunity to do so.
With that been said... how does humanity as a whole achieve its existentialist end? What is our 'best' end game? What is it that we should strive towards?
And my answer to that is - post scarcity. The point at which the bullshit ends and life *truly* begins.
Instead of an unruly resource constrained world where we fight over limited resources and the influence that those resources creates - we gear society towards one of creative experientiality.
Providing each and every human the ability to create, manipulate and engage in the experience of their own choosing as fully as they possibly can.
To a degree... this is always where we've been gravitating. It is the nature of progress - but it's something that's in a way happened more by accident, more as a tertiary affect of some other economic tangent, but one that has always been essential in how we define an 'improvement' and 'progress'.
So... post-scarcity looks like this:
High quality VR; Matrix style, except without the crazy robots enslaving humanity, and without weird arbitrary rules that cause you to die in VR. Best of both worlds - engage in unreal and unlimited experiences, freedom to still participate in the real world.
New economic growth predicated on the idea of sustainability; We don't possess anything of worth in humanity, until it can be reused for as long as we need it. Currently, we have negative economic growth in this sense.
Green Energy - The new world sustains itself off energy that doesn't trash the world - it captures the energy that is already so abundant all around us; taking it from the very air itself.
AI maintenance and governance - With sustainable robot parts and sustainable energy powering those robot parts, and with sufficient intelligence to take care of our menial tasks - including the day to day running of society and civilization - we can see work for what it really is; bullshit that we do for some of the day so that we can ideally do something else for the other part of the day.
Of course some people will be lucky enough to find meaning in their work - but this is a rarity even in this day and age, and it necessarily cannot be for the majority of people.
With these elements in place - humanity is truly free to make the best of life as we wish. You want to be a race car driver? Jump into a VR race club and race to your hearts content. You want to rule a kingdom? Jump into a VR medieval kingdom simulation, and command your serfs in an enlightened manner that only someone from the 3rd millenia can. You want to expand the bounds of human understanding and knowledge? You're welcome to do so!
When we achieve this... we are not at an end of things to do - only the beginning. The meaning of (this particular stage of human) life then, is to find a way to cut out all the bullshit... so that we can live life to its best.