Biblical Archaeology Review is a very reputable journal. However, additional peer review is in order before I come to any firm conclusions.
Should it be authenticated beyong dispute, there will be step-brother from prior marriage explanations, etc. These will satisfy the faithful and Marian doctrine will persist.
This is why I think your response in premature and overstated. All will go on as before within the RCC.
I agree with you on both points, drsteve.
When I say the RCC has now been debunked, I'm talking about for those who read the Bible (the vast majority of catholics worldwide have never seen the inside of one), and those who genuinely seek Truth.
Those are the ones God speaks to via the James Ossuary.
p.s. the "Brady Bunch Scenario" won't fly for this group of people.