That's kind of where I'm at with the whole idea too. Should we be in such a situation, it just moves all our existing questions about "What is reality and the universe?" up one meta-level to the theoretical actual reality. I doubt we would stop finding out as much as is possible about this layer, but we would be wholly unable apply our findings or assumptions to the true reality.
But even if that true reality remains forever unknowable, it at least sets what I would consider some "sensible" bounds on our universe. As things are now, I'm not sure if I'm more dumbfounded by the idea of an infinite universe or a finite one - both boggle the mind for different reasons.