The typical outdoor football field is built on a "crown" where the area between the hashmarks is higher up than the sidelines. That's so rain can flow down to the sidelines and provide better traction in the middle of the field.
In domed facilities, the crown is not needed so they were built without one, all the better to stage non-football events. I think that's the real issue here although I see it being a factor only if the game was played in a downpour. Excessive rains might also flood the field level seats closest to the sidelines.
But if the roof is the only thing wrong and the sod is portable, I just don't see why it would matter to the point of relocating the game. Football was designed to be played in adverse weather conditions.
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