That's not the approach I'd like, either. That wasn't simplifying convoluted mechanics, that was dumbing down the game. Two different things.
I'm just suggesting the Civ rule book is starting to look like the tax act (for whatever country you live in - I'm pretty confident this analogy covers the globe, unless you're a citizen of Saudi Arabia or the Maldives).
Look at Through the Ages for a contrast: simple rules, but a highly challenging and complex game. I'm not saying Civ should be TtA. I'm saying that a tight set of rules built from the ground up with the idea that they would work seamlessly together can offer just as much depth, immersion and game play interest as the current Civ mechanics. Potentially that means the game runs faster (quicker turns), the AI can be more of a challenge without having to be loaded up with bonuses, and newcomers can get quick clear answers for all of their rule questions (possibly even from the Civilopedia).
Sometimes in game design, less is more. Do we really need different rules for moving Traders, Spies, and Builders from one city in your empire to another city in your empire?