I think rule changes shouldn't be implemented for their own sake, but there are a few tweaks needed occasionally. Sometimes it's like the javelin throw in '86 and '99, the rules caused major head-ache with officiating and possibly the potential of them going in to spectators not being a good idea they had to tweak them.
In my opinion the main rule change needed is a ban on the crash structure diffusers, 10 out of 10 for Brawn, Williams and Toyota for thinking of them but they aren't exactly what the OWG intended. The F1 rules don't operate on a principle of "if in doubt, don't" (which is fine provided that is explicity said) but the double diffusers are one thing that could go. Safety measures and cost cutting measures are good if they genuinely work.
Other things are more long term, such as changes in the engine rules to replace the current 2.4 V8s.
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