Firstly I expect Walcott to MOVE. Giroud moved and got on the end of a ball, and opened himself up for a pass by making a run. Walcott didn't get the ball because he didn't make himself available to the ball. Download the game, watch Walcott every time he went for the ball, then watch Giroud, or Podolski, or Santi or Wilshire. When they aren't on the ball they move in to space.
Giroud got on the end of that run because he made the run to the near post, Walcott makes no runs like that AT ALL, by making that run Giroud gave the person with the ball, in this case Walcott an option. If Giroud stood still in the middle of the box directly next to both CB's, Walcott wouldn't have passed the ball to the near post because no one would have been there. Walcott's literally only "talent" is pace, he was faster than both cb's, therefore running across the back line should have defenders scrambling out of position to track his runs, he did not do this at any stage in the game.
So what do I expect Walcott to do against two top defenders... first and foremost do your freaking best to not stand directly next to them all the time.
Watch almost any other striker in the world and you'd see more movement, and the way to beat defenders overall through "good play" is to vary what you do throughout a game. If you make the same "run" which is, following the CB and nothing else, the CB knows where he'll be at every stage of the game, he's predictable and easy to defend against. Simply pretending to run into the box and then stopping to create a 3-4 yard space can make him available to receive a ball, or one CB reacts, goes with Walcott, and there is a hole for others to exploit.
Walcott put in one of the worst, most lazy, most pointless performances I've ever seen, and worse is, he did that with each and every performance as a lone striker when given the chance, so why did Wenger expect anything else.
What would a new manager bring, Arshavin into the team, Sagna getting the hook, Walcott being sold, Diaby and Rosicky being sold, Giroud being given a run in the team.
Lets not forget that Giroud wasn't given starts early in the season, it was Gervinho, then Giroud got a run of games, started to look good and bam, was dropped for Walcott, Giroud came back into the team, played a bunch of games in a row, got a bunch of goals, and bam, was dropped for Gervinho, then Walcott again.... its the age old Wenger game of destroying a strikers form for no reason, to let one of his favoured players have another chance, players who have had more chances than anyone else, and proved to fail repeatedly.
What else might they do, sort out the defence, tell the right back to play, just occassionally, at right back, and teach the right back to actually cross the damn ball. Sagna given the chance to cross first time... does so 1 in 100 times, he'll pee around on the ball, then eventually cross into a defender or pass backwards.
Firstly there are like three managers in the world who would try to turn a top team into Stoke, and secondly, we're failing to win trophies now, so its a better idea to just continue to not win trophies forever, rather than "risk" not winning trophies for a few years with a new manager..... where is the logic there. Risking the FACT that we won't win trophies under Wenger, for the possibility that we might not win them under someone new, in what way is this a risk, the worst case scenario is we continue to be as pointless as we are now, best case is we win trophies, the middle ground is we improve but don't win trophies.
As I've said many times, sticking with something you KNOW isn't working, for fear that the next guy might not also work is daft, because nothing would be worse. Trying to get better even if we fail to do so is a massively better option than not trying to improve at all.