Come to think of it: Is alicorn agelessness also magic? Because if so and if magic is gone for long enough before the movie, then that could potentially mean Celestia and possibly other alicorns would be dead.
And agelessness won’t be in “rubber band” form, hence why Celestia survived and still doesn’t look any older despite her loss of magic during Tirek’s attack in FiM Season 4.
Not if the alicorns ascend out of the world of the mortal into the mysterious magical space that is unlikely to disappear if the magic of the world of the mortal disappeared. But it will be a one-way ticket for the alicorns - and maybe that’s what Lauren Faust wants. At the end of the G5 in several years, it is possible, if this theory is accepted, that Twilight and Sunny will meet face to face.
The image of Sunny with the false wings was obviously chosen as a warning of her fate as with the scene when Twilight as foal saw Celestia’s sunrise ceremony for the first time. If she managed to reunite Equestria and re-establish harmony and friendship so that the legacy of the alicorns will not disappear, it is clear that she will ascend to the magical space and become an alicorn. But I do not think this will happen until the last episode of G5, regardless of the seasons. If the planned three seasons are extended, her ascension can be put on hold.
It is my dream that we will see a certain book at the beginning of the movie, and that Twilight and Sunny will meet in the final of G5 in many years.