but will there be increases in available resources on the map to compensate?
No. Actually I'm trying to do the opposite. Resources must not be found in abundance - they must be attractive - worth capturing - and necessary for the economy.
If you change things for fun for humans, it doesn't mean the AI has a clue what to do with it.
I know - this isn't my first attempt......
I have some pointers: Is it going me "too well to be acceptable"? Is the AI producing what it should? Spreads - grows - makes use of the buildings that supply the "new" bonus/resources - do it make use of the military buildings that give exp to its troops - so I have trouble "surviving"..... If the answer is "Yes" at least upto somewhere in the Renaissance Era, then the AI "understands" the changes sufficiently.....
Also, I am strongly against the removal of map trading
You are allowed to be so.
However, I don't think there has ever been an overwhelming desire to share maps with potential competitors - at least not entire maps of one's own country - or for that matter the path to lucrative markets "far away from home".
In my personal version, the only way forward is "hard work". Both "I" and the AI must use whatever is available - ships, explorers, scouts, spies and/or regular troops. There is no and there should be no "easy fix for everything".
Other than that, my experience from the "old days" is, that the more you can see of the "map", the slower the game becomes......
I just find it ridiculous that a nation filled with forests would be unable to cobble together a working naval unit because they lacked prime timber, for example
All my maps are "handmade" - they often take 2 weeks to complete
*). All nations will recieve 2 PrimeTimber, 2 Wheat, 2 Limestone, 1 Iron and 1 Copper tile within reasonable distance from their starting location. What happens later in the game.... well it's not unfair that you can't make a ShipOfTheLine if you only have some small cities without the needed resources such as planks (naval supplies) because you lack the needed quality of trees (PrimeTimber) yourself and nobody wants to sell it to you - or you do not have the needed shipbuilding-facilities such as Harbor and Shipyard. But still - you are able to make galley/triremes without ressources or buildings........
*) Edit:
I forgot to add, that my master-maps (now) are saved in WorldBuilder format, which enables me to load the maps as scenarios. In this case I'm able to choose anyone of the 18 civs I have placed. Only thing I have to choose is the difficulty level I'm using myself (monarch, default for all nations in the master-map is noble). So partly I'm able to test all nations and compare with results of earlier games, partly I don't feel 14 days for a map is overkill.