There were some protests by the black scarf movement late last season at the Villa game. If Wenger doesn't invest the money from the Cesc/Nasri sales and buy top quality players to replace them, as well as signing a defender like Cahill, then the voices of discontent will grow louder and louder and I'd expect to see more protests about the direction our club is heading. Even against Newcastle yesterday, there were chanting "Spend some fucking money" so I do think the fans are extremely angry at the moment, and rightly so.