Seniority shouldn't matter at all when it comes to judging. I don't care if a team has skated together for 2 months or 20 years, if they skate the best, they should win. And wasn't this exactly what fans of ice dance has complained for decades - that newer teams can't beat older ones even if they clearly outskate them and should "wait their turn"?
Besides, Laurence Fournier Beaudry is the opposite of a newcomer, she is 33 and has competed at the top level of the sport for a very long time. She was held back by a weaker partner and lack of fed support, but she has been recognised as one of the most skilled ice dancers for a long time.
FB/C are far from my favourites, I am personally rooting for Charlene and Marco and really want them to get a medal, preferably gold, at their home Olympics, but if FB/C outperform them and win at the Olympics, I'd congratulate them for their deserved win.