People who speculate that the Franco-German axis will collapse are, pardon the severity of phrasing, blindsighted from reality (and history). It equals to hoping Canada and the USA would stop trading one day.
No one knows how the die will roll in the future, but I'd be interested as to how the fledging role of Italy could be drawn into the "mainland" Europe economy. Somehow, Italy hasn't really recovered from the sag in its economy, but if it would recover an axis formed by France-Germany-Italy would simply be fascinating.