That is quite possibly… possible.
Many people can come up with their own theories and opinions, but the truth of the matter is, no one really knows. Most of us will continue living our mainstream lives, saying that this is reality, and our dreams are simply dreams.
But there could always be that small doubt, I suppose. That this is not reality, and maybe a dream? How could we know? Maybe its not as simple as becoming “lucid” in our dreams?
It could be that we may never come to realize it is a dream, as in, perhaps this is like a movie: We live in this “dreamworld” while the “real” dreamer is asleep. But when that dreamer wakes up, our “dream” life is put on pause, and we are completely unaware. Then when this dreamer goes to sleep, our dream lives (which would be what we consider “reality”) continue as if there was never any interruption. Just some ideas/thoughts (Sorry if that was confusing xD)
Its difficult to say anything for sure, but the way things are, I suppose its easier to say that this is reality.