Shuri is dead, at least according to the first trailer.
That said, I don't see why Vision can't be repaired and revived relatively early in Endgame. He is a robot after all.
If my theory about the destruction of the Mind Stone and it's restoration being the cause of the time vortex is true, Vision's first death at least
cannot be undone.
1. Vision wanted himself and Wanda to quit the Avengers. Foreshadowing the epilogue of Endgame, perhaps?
2. "I just feel you." This line, as you understand its meaning, hammers home that without the Mind Stone, Vision cannot feel her, and she cannot feel him. He even turns White when Thanos smashes his skull and removes the stone. The mind stone thus will no longer have anything to do with Scarlet Witch and Vision; it's story is done.
3. Strange, in giving Thanos the Time Stone, killed Vision's humanity, and as such Wanda may well carry a deep distrust of him.
4. Vision alludes to a "sufficient power source",
separately from stating the matching energy signature. We see Wanda destroy the Mind Stone AND easily subdue the Space Stone. She overpowers 2 stones, which rules out the Mind Stone as her sole power source IMHO, and suggests a possible third party.
5. Wanda being dead until at least the third act, is a problem as Vision didn't interact with the other Avengers much, and him being emotionless makes that a huge problem.