Well, first you need a Swartzchild wormhole, which is itself unstable, disconnecting the moment it connects. Second, white holes themselves violate the second law of thermodynamics. Third, quasars and active galactic nucleii spew out jets formed from the accretion disk via magnetic fields which warps the matter towards the poles. Forth, some researchers are now theorizing that when a black hole forms, it creates a new universe which spews the matter out in sort of a "cosmological white hole." But this isn't a point source. Rather, they theorize that it's all throughout the universe, or only at the outer bounday.

Thus, there may never have actually been a Big Bang. Everything we see might just be the result of a supermassive black hole in another universe, perhaps one where time runs backwards compared to us.