As has been mentioned before no manager without any success would have survived as manager of a big club...
Stopped reading the moment you framed the debate using a false statement. We don't have any trophies but to say there has been no success is to ignore everything that has happened over the last 10 years and also the result of that period. Whether we agree with it or not, the plan was to move to a bigger stadium and build the finances of the club to a position where we can compete at the very top of the game. It appears, fingers crossed, that has been delivered. Most in the game would point to it as a massive success. Whether stadiums and finances are what the fans care about the most is another matter. I guess if we start seeing these resources spent on the team everyone will suddenly be a big fan of the last decade.