We don't know how D/R will skate at Worlds. If they mess up and win, it'll indeed be a win by default (if everyone else messes up too) or by overscoring (more likely...).Although their style is not my favorite, a win by D/R should not ever been seen as a win by default. The technical content in their programs has been a game-changer in pairs skating. Their influence on the future of the sport is, at this point, incredible.
As evidence, I suggest we refer to this thread. Essentially, D/R's main competition for the season has thrown in the towel, giving up any hope of defeating them, and has begun working on a more impressive technical arsenal so that they might have a chance next year.
That is not "winning by default." That is "dominance."
As much as I might prefer another pair in terms of style, I believe they deserve this world title, and I think they would be worthy champions.
S/K dropping out of Worlds doesn't prove anything about D/R or their "dominance." It just proves something's up in Team S/K. In fact, S/K's actions are bizarre precisely because Worlds is not a done deal, to most people anyway...