I dont think that it would be like a black hole, but an omnidirectional white hole of sorts in which the origination point of the energy would be in the middle of the wormhole, since shinra tensei expels energy rather than drawing it in. I believe that it could, but only a Shinra Tensei with a gravitational force comparable or stronger than a black hole would be necessary to distort the affected s/t around the wormhole enough to close it.I would argue that he could not the reason I say this is because kamui seems to work like a wormhole which opens different dimensions and bends space time. Gravity can do the same but that brings us to the question of can a black hole swollow up a wormhole and from my understanding it cannot.
Ill bring up my posts on this thread. One sec...