I find it amusing that many folks who poopoo the notion of Hell are usually familiar with the nature of black holes ... where time is stretched into infinity at the horizon of a star (hot, don'tchaknow) with such powerful gravity that even light will not escape it, where being inside would allow viewing of what is outside but outside cannot see inside.
Then we should speak of Hells, not Hell, and acknowledge that there must be billions of places that qualify as "hell."
Your theory would make Hell(s) temporary, as black holes are not permanent, eternal structures in the created finite, universe.
You treat spiritual separation from God as a physical "place" where God isn't, and subject that which is spiritual (i.e. love) to gravitational laws!spiritual!