A few of us here have already tried mentioning this to family who are still in. We're usually met with the same response. No interest. The guard goes up, and they refuse to hear it and, in my case, even get angry.
I think that even if the GB were to recant and say "Well, yeah, Jesus apparently did die on a cross", many would just be so brain-dead that it wouldn't register. And I'm pretty sure they'd make up some excuse as to why we shouldn't recognoze the cross anyway because of its Pagan origins and make sure that everyone knew that it doesn't matter WHAT he died on, and even though this "new light" shows that we were mistaken, we should still not have any involvement with the cross at all.
They also MAY take the smaller sections of these writings and prove the name YHWH, which would tickle the little dubbies asses to see, and yet not really mention that it talks about the cross at all. I mean, look how much spin doctoring they've done throughout the years. They are masters at manipulating what is written to fit their agenda! They're masters of mind control and the dubs will believe what they are TOLD to believe. I don't foresee that this will be a huge issue.