I have been pondering this exact same concept for the past few weeks now as well, It's been plaguing my mind and I actually Googled this and found your post.
I am trying think of experiments to test this hypothesis, the only thing I can think of is to somehow manually stretch a photon, somewhere in the department of lasers might help, at my uni there is a major in BoS Photonics. But even then trying to measure if Dark energy is created would be difficult because the way we measure Dark energy is by the redshift of photons, so there are complications.
But I certainly agree, my notion of this was;
Since the universe is expanding faster and faster caused by Dark energy, what is fuelling this dark energy as the speed is increasing and not the same static growth of the universe. This would infer that more Dark energy is filling the voids of space to help expand it faster. So where is this Dark energy coming from?
I then began to think about, a trillion years from now how we've predicted that we will only be able to see our own galaxy and all other galaxies will be too far away from us to see their photons, what happens to a photon that never goes anywhere and is constantly travelling through space never reaching anything or being too far to have gravity pull on it, does the photon stop? Does it simply stretch out so far that it changes?
These compositions of thought lead me to think what if a photon being completely stretched out to its breaking point turns the photon inverse and instead of being a particle that is being pulled, to becomes a particle that pushes.
So in effect it pushes space at the rate of which it was being pulled because of the fact it has been stretched so thin that it can touch the fabric of the cosmos and is able to push it as if spacetime becomes like a sheet of silk and the photon becomes like a hand.