I'm not sure he even knew there was going to be a TTC. He died four years before they even started constructing it. Not to mention the fact that at that time he was completely focused on his City of Tomorrow. He had left the set up for MK up to the Imagineers because it was very similar to Disneyland and his input wasn't really needed nor did he want to be part of that planning. He had bigger fish to fry. However, that said... it was a brilliant design. If anyone had ever been there when MK was all there was. It was so exciting to ride the Monorail or take the Ferries. They only reason why any complaints show up know is because of the inability of vacationing guests to actually relax and enjoy the total experience. Nope, it's got to be everything right now. No anticipation, no wonder.
Besides it is a mile walk from TTC and frankly one is going to do enough walking throughout the day. It would end up being a one way walk by the time the day was done. Besides the time it would take to walk that distance one could have ridden there about three time. It would be a huge expense that would be used by very few as well as be a pita to maintain security. Another thing that most don't think about is that cold blooded critters tend to head for the warmest spot (paved area) after dark. If one was lucky they would be likely to have to step over a lot of slimy things as well as an occasional large mouth prehistoric creature. Just made no sense to do that. Way to much nature between TTC and MK.