The Hilbert's paradox of the Grand Hotel does not contend that infinity is an impossibility.
If matter cannot be created nor destroyed, then it seems logical to me that it goes somewhere, perhaps rebirths as another big bang.
The time scales at which this may happen are so large that our brains literally cannot comprehend them - far beyond billions of years (at least that is what is stipulated by some that study these things). Of course, we have no way of ever playing that out and witnessing it.