Actually, It wasn't REALLY walts idea for World Showcase, he just wanted EPCOT, but his dream lives more in celebration then in Epcot...
But...
From most of the concept art you can find in the Imagineering book, which was done after Jaffery supposedly met with Disney, it looks nothing like what Jaffery had proposed..It looks like a BIG hotel with no lake, no facades, no gardens, no nothing. So, if the family WANTS them to release old concept art, they're going to find that a majority of it looks nothing like it...
As for what WS came out looking like...I do think it was coincidental...Seriously now, What else would you use to represent france then the eifel tower?!? ANd the Monorail does NOT run through WS, it goes through Future world...And a lake is just a logical solution to divide them up..
More greedy people wanting money...Probably so they can afford to GO to disney world..