There's one issue of Civ 5 that I consider it hurts the mid game gameplay: the requirement of needing to build the prerequisite building in all of your cities to build a National Wonder. In previous versions of Civ I enjoyed so much to explore uncharted lands (once researched the appropiate technology: optics or navigation) and find a sweet spot to build a new city and develope it. With Civ 5 I can't, because at that time I can afford the hapiness and cultural costs to found a new city, but it prevents me to build key National Wonders in my core cities. Also, at that time, I usually don't own the necessary gold to rush buy the prerequisite building in new cities (at late game, with lots of GPT, this is not a big deal).
So I propose to remove this requirement from the game and use the approach I've seen in several mods: if the prerequisite building is not present in some cities, just increase the hammer cost of the National Wonder by a fixed amount for each city without the prerequisite building and a multiplier for the number of cities that don't have it. For example, to build a National College with 3 cities and the library only built in the capital, increase the cost of the NC by the hammers needed to build a library in both cities, multiplied by 1.20 (a 10% increase by each city without the prerequisite).
What do you think about this idea?.
So I propose to remove this requirement from the game and use the approach I've seen in several mods: if the prerequisite building is not present in some cities, just increase the hammer cost of the National Wonder by a fixed amount for each city without the prerequisite building and a multiplier for the number of cities that don't have it. For example, to build a National College with 3 cities and the library only built in the capital, increase the cost of the NC by the hammers needed to build a library in both cities, multiplied by 1.20 (a 10% increase by each city without the prerequisite).
What do you think about this idea?.