This is somewhat triggered by this question: It's established that universal energy is not constant. But is the net change positive or negative?
When I say entire universe, is that equivalent to "the observable universe"? Since the universe beyond the observable universe cannot affect us in anyway, it might as well not exist. The fact that more of the universe becomes observable over time, just means that the universe is expanding.
Of course, when we consider our space time models, we do model the parts of the universe that are not observable. So in our models, the universe is more than the just the observable part.