I feel like I'm a stalker at this point!
Honestly, I don't think it has too much of an impact. I think most people with
free dining will hit World Showcase restaurants or if at a resort, signatures.
the only possible issue could be if people don't make adrs and have free dining, they may be forced to go to places that accept walk ups. I honestly don't see this being a big problem.
Obviously, every year is different, but we have been going in August for the past 9 years and 90% of the time stay at an Epcot resort. ESPN will occasionally have a wait, but it's never ridiculously long.