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Most bikes are BSOs and won't suddenly change to tubeless set ups. Look at how many quill stems are still used at Halfords and other places. Ahead stem clearly better than threaded but not universally adopted. I think most staff would struggle to explain why 2x10 gears are better than 3x8 to the general public.
Tubeless also requires better pumps and fluid which is going to be a challenge given how many people think a £5 hand pump is all they need.
Essential in much the same way as whale-oil lantern maintenance is a vital skill for 2017?
I reckon we'll see the end of inner tubes for most bikes within the next five years as most things move to tubeless.