We're likely to end up in a society where human labor is unnecessary one way or another, simply because of the advance of automation and ultimately AI. We do not have the choice of preserving the "work paradigm" indefinitely — that is, unless we end up in a Bad Ending where the future of humanity is vastly warped or curtailed.

I lack the information necessary to evaluate what is likely, but barring very specific definitions of the word "unnecessary" I don't think it's obvious that it's impossible without massively curtailing the future of humanity. If the importance of the work paradigm exists and is fundamental to parts of human nature we like(1), there are a number of imaginable ways for those to be made necessary even if it could be made unnecessary. While some of these possible futures are dysutopian (Brave New World), not all of them need be.

(1) I'm not sure this is the case. Some sort of act-or-unpleasant-things-happen seems necessary to get a good future, but this may or may not circumscribe the work paradigm.