Silence101
King
If you have maxed out your wonders in your capital, chances are (barring the rarity that there are no other industrious leaders) that the non-industrious civs do not have many (if any) wonders in their production city. If you are forced to move wonder production to a secondary city, your bonus may be nerfed to be on par with non-industrious civs. To obsolete a trait like that seems rather silly.
I think your point assumes that a given industrious Civ's secondary city will be at an extreme disadvantage when compared to a non-industrious Civ's capital or primary wonder building city. I agree that that's a possible scenario you could run into, but I guess I just don't see that as being the typcial situation. Again, personally for me, it's common to have a few cities that can manage high amounts of production on par with my capital. Is that just my style of play?
Also, I don't see how wonder caps would promote city specialization. If anything it promotes city hybridization since you might have to get rid of windmills to build mines in order to maximize production for more wonders. And then you might have to get rid of some cottages to put in farms so your citizens don't starve.
I thinking more in terms of wonders like the GL where there's city specific benefits and also how wonders provide specific types of GP points which encourage you to run specific types of specialists to ensure you get the desired GP. I do see your point though, with encouraging hybridization. And granted most wonders don't provide city specific benefits. So, I just might have to give you this one.
