I think you said it well, I do think this kind of 'Life is much like a dream' attitude will occur to most people who Lucid dream a good amount, I think this idea is almost inherent in the idea and experience of the lucid dream state. But of course a knowledge a Buddhist, Taoist, Hindu, etc philosophy would increase the likelihood of this realisation, like you said as well.

"Doing the same they did with mindfullness meditation and use it to improve the relative condition of people."

This is a very interesting idea and I do think this is very possible, lucid dreaming increases mental flexibility and automatically gives one a new perspective on life in general, this I think can help people break out of negative, mechanical, and neurotic thinking and behaviour patterns. This seems similar to what I have read about LSD and psilocybin therapy. I would not be surprised if one day in the future lucid dream practice, and contemplation on the insights it is conducive to, become a accepted treatment modality in the therapeutic setting.

I also think that being in the lucid dream state has another psychological benefit. Considering how limiting physical life is, one is continuously imprisoned by gravity and the slowness of the physical body, it is only in the lucid dream state where one inhabits a body which meets the minds hope and need for freedom and fluidity, which sadly normal life cannot deliver. I always experience the lucid dream state as a great relief and consolation for many hours of boredom and inadequacy. Ones day is much better when one can enjoy the memory of a better place and look forward to the next reprieve from physical existence.