They [pit stops] have got so fast - the top teams are routinely changing four wheels in 2.5 seconds - that it has gone too far. They are lovely to watch, but you can't see what's going on.
I would suggest reducing the number of people allowed to work on the pit stop to two on each wheel, a front and rear jack, and the 'lollipop' man who controls the driver. That would be 10 people who touch the car, plus one.
At the moment, there are about 20 - three on each wheel, two jacks, two spare jacks, two car steadiers and two pit-lane watchers.
In Webber's stop, the lollipop man could not see what was going on with the right rear wheel. He thought it was on; it looked on. If there were fewer people, there would be less confusion. Do that, and the pit stop would take in the region of four seconds, which is still fast, but enough time to react to problems. In 2.5 secs it is difficult to make decisions based on what you see, as opposed to what you think you're seeing.