It won't be 5 years. This shared belts is the next step in it ending. They keep chipping away at it.
It really depends on your definition. By 2009 not only were they sharing PPV, but the belts were starting to merge by the end of the year. To me it's only a split when you have a full split. Once you've got half a split, it's over.
I believe the women's belts will be merged this year. Than when SmakcDown gets to Fox, I doubt we won't be seeing Brock, Ronda and Cena every week. So either the split ends or Raw gets none of the top stars.