But things like the speed of light means it will likely always be a closed ecosystem.
The speed-of-light must be quantized else we can't measure our relative existence, but it is not bounded. Not understanding the distinction is a fundamental error of conceptualization.
For if it is was bounded, the universe is deterministic, pre-ordained, static and thus we don't really exist.
CoinCube and I have discussed in private that perhaps Godel (Godel's universe) had shown it can be either way working from the equations of relativity. But neither of our math capabilities is sufficient to verify this from a derivation point-of-view (and CoinCube's math education is more extensive than mine).