Apparently because he wouldn't score as many goals or summat?
Anyboobs, i think its a great idea, i would even go as far to say that we wouldn't even really need a ridiculously good striker (Although Cavani would be awesome) as Podolski could player there.
Sagna - Koscielny - Vermaelen - Gibbs
Song - Arteta
New winger - Podolski - New winger
New striker - Giroud
New midfielder - M'Vila/Good all action CM like Dempsey
New Goalkeeper - ??????
Wingers - Anyone with pace and power
Sadly i doubt it will happen, although i can see Wenger trying something like this in pre-season.
Oxo - Van Persie - Podolski