I agree with you logic. I mean they might take the headphone jack away and the put the FPS under the display. That would kind negate the effect of removing the headphone jack to its customers.I doubt Samsung would remove the headphone jack and have any type of notch at the same time, that would be too much to bear for Samsung fans. Look how Samsung consumers reacted to the removal of the SD slot.
It's either going to be removal of the headphone jack and no notch, a notch with a headphone jack, or no notch and a headphone jack. I personally think the last option is most likely.
One thing you can say about Samsung....they do listen to their customers feedback.