Was your co-worker going to WDW regardless? Or was he going because of the FLE? If it's the former, then he's not part of the discussion. My theory is that the later group, people who decided to go to WDW being drawn in because of this new fangled addition to Fantasyland, is a virtually non-existent group.
So, my point is that I don't think the FLE is going to have an appreciable effect on increasing visits to WDW (which is what article said has been the case so far). However, I just think it is premature to determine if the FLE will have any effect on bumping up attendence until it is totally complete (Fairtale Hall/7DMT) because -- in theory -- the hoardes just waiting to see this wonderful new place might put off this additional WDW vacation that they otherwise wouldn't take until they can see everything. I still think that such a group of people is non-existent and that the FLE will have no appreciate impact on attendence, but if there are people specifically going to visit for the FLE, I would think they'd wait for another year until it's all done. Conversely, I think that most people are like your coworker and are going to WDW and the FLE is just an incidentabl happening, not a real draw.