Considering that a recent study article reinforced the official position of no infant baptism and that the baptisee should have accurate knowledge of good and his purpose (they unknowingly nullified every JW baptism with that one tho) otherwise the baptism doesn't count. Because of this,I don't think it will change any time soon.
If it does change the way you suggest, they may simply have the pregnant woman go into the baptism pool chest deep, enough to cover the location of the womb.
I think it could happen. It would either keep more kids in the bORG from birth on into adulthood.. or you may lose more kids to DFing than would be the case if they were not held responsible just yet.. because of... well we know how kids are... And those kids probably wouldn't go back to the bORG.. Roll of the dice there but the GoBo is not above that so who knows.