Why are we (Arsenal) falling short when it comes to challenging for the title ?

Arsenal have had critical injuries to star players the last 2 seasons. The younger inexperienced players were thrown in at the deep end and did a damn good job. If we'd had our first choice team out all season long we would have been in the championship race both years and certainly this year would have most likely won it given the drop in form of the other top clubs as a whole this season. When you have to keep changing the team around, there can be no consistency.