It has to--mathematics it he language of physics, so we need to fully understand what mathematics says about infinity before we can start thinking about what nature might say about infinity.

Of course, we might need new math, but existing math is always the best place to start. If we work out the predictions of an infinite universe based on mathematics, we can then scientifically evaluate those predictions and see if they make sense. Unfortunately, much of this thread is putting the cart ahead of the mathematical horse and using intuition to argue about infinities, without a firm grounding in how the mathematics of infinities work and what this means for predictions.