Absolutley, I don't disagree. Here is the thing though....
The competition in Orlando and area is getting better. Assuming Uni actually builds the Nintendo world, and also adds its 4th(really 3rd you can't count a water park....sheesh) gate, Disney must keep pace.
Now, do they need a 5th gate? I don't think so. I think if they do what they are currently doing plus a bit, they will more than compete and continue to dominate....
First - continue with replacing poor executions - example - GotG for Energy, upgraded speedway with Tron add and such. Stitch eventually needs replacement, so does the Indy stunt show IMO.
Second - continue to ADD to the parks - Tron in MK is a great example, Rat, UK ride and new pavilion in Epcot is another. Avatar in AK as well. But Epcot, DHS and AK need MORE and MORE additional.
Third - continue to add resorts themed - I think this is the next step in immersion. Star Wars resort in DHS area that has a direct tie to the land both in theme, path and execution will only add to the stay. Would love to see the new add in EPCOT be space or future world themed.
But it can't just replace, I don't think that is enough.