Of course consumers want the headphone jack. Nobody likes having any functionality taken away.
But did the poll ask them which they want: Thinner iPhone/No Headphone or Thicker iPhone/Headphone
But did the poll ask them which they want: Thinner iPhone/No Headphone or Thicker iPhone/Headphone
Were the new generation of phones thinner than the jack I'd have to concede you may have a point, but that is not what we're getting.
If the question becomes "would you like 0.2% more battery or a headphone jack?" I doubt many would vote to remove.
The iPhone X battery is rated for 2716 mAh.
So if you could use 100% of that volume efficiently for increasing battery volume, I think battery capacity increases approximately 6%.