I believe the implication has been that the two universes have been on a collision course since Walter's actions and only one will survive. I think that is separate from the act of sending something here over there and getting something back.
I wouldn't hold the producers for this show at their word. There's been a lot of leniency on many many things and I wouldn't expect the explanation for this to be any different.


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, or All universes destroyed???
, or All universes continue to exist???

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