Actually, all this does is ignore the question. It is really no different than chanting a dogma about a deity that "always existed"; hence one need not explain where the deity came from.
Proposing a temporally infinite series of Universes is essentially the same as throwing up our hands and saying we have no idea where they originated.
The BB at least has to come to grips with the question; some may not like the answer, others may complain that we don't know enough details about the answer, but at least it doesn't hide from the question.
You must concentrate, Grasshopper. Think deeply. The truth will come to you.