Well, I think you're kind of conflating two things here. It's not necessarily wrong to say that observing something solidifies it into being, because it's not

Well, I think you're kind of conflating two things here. It's not necessarily wrong to say that observing something solidifies it into being, because it's not really a scientific term. There's too much philosophical about the term 'being' But the overall star formation of the universe isn't likely to be too tied to having to observe or measure things at the quantum level. There's some caveats there, and it's theoretically possible that a huge amount of mass could just appear due to quantum tunneling, but isn't likely to occur in any place or time relevant to us, or even our observable universe before heat death. As for the second bit, the observable universe is the key, and we're back to the philosophical. It's unlikely we'll be able to ever travel at the speed of light, or faster than light. Even assuming we can get pretty close to the speed of light, similar to what we see in relativistic jets, and could do so today, and didn't care about making it back, we could really only reach about 3% of the stuff we can see now before the expansion of the universe takes it forever out of our grasp. And the universe is expanding everywhere, so even if there was other stuff that is, without expansion, moving "towards" us outside of our view, it won't be able to overcome expansion. So we'll never see it. Maybe somewhere out there in the cosmos is an area where there's a ton of star formation left to go. But unless we can somehow travel faster than light, it has zero ability to impact us. We won't ever be able to observe it or confirm it. At that point, does it even actually exist, as far as we are concerned? Does it make sense to even really think about it or consider the possibility?