I think he would have done, in the same way I am pretty sure Roberto Mancini nor Manuel Pellegrini would have ever won the title with Arsenal at any time.
I think Bilic has over achieved with West Ham, where as considering the squad at his disposal i think Pellegrini has underachieved with City
Well i say under achieved, he has achieved what he is capable of as a very average manager. I would also add a very average and old manager....two years younger than Wenger but makes him look youthful
All managers are flaws and one mistake I feel the I HOPE WENGER DIES PAINFULLY (may be a slight exaggeration) brigade make is to think that Wenger has all these flaws which he's suddenly developed and the next bloke won't have any.
The truth is Wenger has always had these flaws, they were just masked in the past by his strengths which in the early days gave him a massive advantage over the rest. Others soon adapted and he no longer has that edge.
And of course the next bloke will have flaws. Klopp spent most of last season battling relegation with Dortmund. Maureen pissed off people at Chelsea so much that he created such a toxic atmosphere that the reigning champions were in a relegation scrap till they got rid.
They all have flaws and one problem I see is the situation at each club is different. Success at one club doesn't guarantee success at Arsenal, and I guess failure at another club doesn't guarantee failure at Arsenal.