Did you hear about CSS 4?View other answers to this thread
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Don't use sass/less for long time and I do use "CSS 4" with PostCSS+CSSNext. It's like babel for CSS. I just convert future/very new CSS into CSS3 for all platforms.
Apart from that there is also a CSS Houdini.
So, preprocessors won't be needed at all, they are not really needed even today.