Question is why has it taken 5-7 years for Wenger to open his eyes....
Who says he's opened his eyes? Might buy Podolski, MIGHT, we MIGHT have agreed a fee and he might agree to come, though we'd have a far better shot last season as his scoring record is brilliant this season which means far more people will be interested in him leaving him some other options.
Apart from that we don't know that Wenger won't let another couple good players go and buy crap players to replace them, or that Wenger isn't going after Podolski as a direct replacement for RVP.
I've yet to see an indication he doesn't want to stick with Walcott, and Gibbs/Sagna, nor is he favouring Chamberlain over Gervinho since he was back(which I pointed out Wenger getting credit for playing Ox only when gervinho was unavailable was premature/stupid), and has also stated that he see's Chamberlain's role as central midfield. Which is just brilliant, yes he can be a good player there, defensively as well as offensively.... he's still currently our most in form and highest quality winger and Wenger has already suggested he's going to move him to a different role.
Personally seeing nothing changing, and getting 4th, or even third, over a Redknapp who went completely mental(working formation, winning, even in a title fight, then random formations and squads costing points for no reason, Liverpool awful, Chelsea awful, Newcastle fumbling it in the final stretch), will simply confirm for Wenger that he was right(and too many fans) and he'll continue to do everything wrong, till that one year when everyone else in the league isn't completely crap.
This squad + Podolski, is MILES off City/Utd, who are both miles off Barca/Real at the moment, probably Bayern and others as well. 4th for us this year is nothing short of failing the least badly of the 4-5 rivals we have.