I did like that with another injury crisis and in particular Wenger complaining constantly that Sanchez is knackered so we get Sanchez not subbed off despite leading 2-0 at half time with an opponent that was awful. We should have brought two people off at half time or maybe 60 mins into the game latest including Sanchez. The second it was 3-0 we should have made those subs at the very least. Instead he waits till the 82nd minute to make two of those subs.
As for if we move forward. Lets be honest, we won't win the league, we won't get far in the champs league.. we absolutely could win the Europa league. Even with weaker competition there are some great clubs in it and Arsenal have a general attitude of bottling it. But I'd still say we have a great chance to win the Europa league and honestly it would be better for us to try that than lose out in the first knockout round of the champs league..... again.
More money afaik in going the rest of the way and winning the europa than one more round in the CL.