I agree, Robben 'would be a great addition to our squad'.
Having said that, Arsenal can't afford his wage demand, or to rephrase, our current wage structure which is predominantly based on an equality won't be broken to accommodate Robben's wage demand. He's currently on a tidy sums with Bayern and one of the highest earners in their squad.
Most likely, he would end up at Galatasaray (who can afford him) with his old mates Sneijder and The Drog. Just can't see it happening at Arsenal but would be a great signing for us certainly.
His age is an issue, hes 29 soon 30 (i think) and the one position you can guarantee wont last is a winger. wingers are almost always the 1st to lose the pace, sooo badly needed at top level to perform well.