Still waiting for Spielbergs unique genius to shine forth.
There are just so many ways this can end, and they have all been thought of before...just guessing here...:~)
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Dumb ending #1: Aliens give up on humans, take the girl and leave.
Dumb ending #2: Aliens are really dolphins, take the girl and leave, saying, "So long and thanks for all the fish".
Dumb ending #3: Aliens take off their gray suits, reveal themselves to have horns and tails, proceed to create utopian society on earth.
Dumb ending #4: Aliens give up on humans, quarantine earth from all future contact with the galactic empire.
Dumb ending #5: Girl does the time warp again, moves everything back to 1947, only this time it's going to be different, nobody will get hurt.
Dumb ending #6: Girl wakes up and it's all a dream.