An almost accepted opinion that seems to be doing the rounds currently (which the only Arsenal fan in the office shouts very loud to make it extra true) is that, if only Arsenal could keep all of the brilliant players they produce, they would be champions elect.
Now while it is undoubtably true they would be a better side, the only players I can think of that would automatically get into a current starting 11 would be Fabregas (who has only been gone for a few weeks) and Ashley Cole. Strong arguments could be made for Toure (although I think Koscielny looks decent when partnered with Vermaelen) and Adebayor (obviously not at the expense of RVP).

But, the majority of others, at least those I can think of, would be bench warmers, eg: Hleb. This greater strength in depth would allow for more tactical options, although Wenger rarely deviates from his default formation, insisting his team can win playing their own game. The added mental toughness of experienced pro's would possibly help, but if they had spent years at Arsenal failing to win anything (as I believe they would) then they would not be the answer to Arsene's woes. Potentially it could reduce injuries, and would probably improve the team when injuries or suspensions arise, but I honestly do not think it would be enough.
I am ignoring players such as
Henry and Pires, who are nowhere near the level the used to be at (although they would undoubtedly add mental toughness / winning attitude), but for my mind Arsene simply hasn't bought or produced enough quality in recent years, regardless of what his staunch defenders will claim.
Jack (Expecting to be corrected/shouted at) Manchester