You really sound make him sound like a nothing manager. He has assembled this very team at a negligible cost and we have led the table for most of the season despite leading the injury league.
Wenger needs to stop doing the minimum it takes and start doing the maximum it takes in the transfer market. I personally believe too much is made of his matchday performance as such. He might be slightly rigid, he might make mistakes like a lot of other managers make but he isn't inept like so many make him appear. He is still a top class manager for me.
However, if he fails to win anything this season, I would gladly see us refresh and bring in a new manager with new ideas who has been given a fantastic platform by Wenger to build on.