I'm divided too. I think it could introduce some interesting stories and character devolopment. The most natural development would probably be 2 devoted parents. Rogue is perfect for at least one epic mama bear story where she goes for the record in property damage.
The downside is that I'm very skeptical considering Marvels commitment. Will they time travel the kid? Outright kill it for drama-points? Or use it to reflect negative on one of them? Overall I think the story is to fraught with negative choices that Marvel can't handle it. Perhaps if they had some writer handle the first few years to set up a status quo that is too hard to break. Overall a little mischievous Romy-kid for future stories would be very cool. A bit reckless, a bit clever, a bit bold and with a big heart for her/his friends. Someone who proudly says to his friends: My dad is the king of thieves and my mama can beat anyone.