You'd have to change that say "I'm not going to WDW again" to actually have an effect. As far as management would be concerned, who cares if you don't go to Epcot anymore? You'll spend your money in MK, AK, or DHS.
If in the off chance WDW started on a "convert everything to a rollercoaster" process, they'd give me less reasons to go to WDW. Why would I want to fly 2 hours and spend $$$ in their parks when I can go to Cedar Point (that is only 2 1/2 hours driving away) and ride more exciting coaster then WDW would ever dare to build (not even talking height and speed)? You can stick as many screens and AA's in it as you want but if it's just a bunch of boring straights with a turn here and there, what was the point? You could've made a longer, more in depth dark ride instead. I go to WDW for unique rides (and experiences!) that I can't get anywhere else.
I doubt WDW would build a coaster that comes close to Maverick (as an example) in terms of excitement. It has a pretty small footprint and short height (120ft). Now I'm not knocking it, it has the forces, inversions, and quick operations to make it a favorite of mine. I'd never expect anything tall in any Disney park, but short and packing a punch is what they'd have to do.
I'll sadly agree, but the Horizons fans were out on my Christmas trip. So much that my parents had to ask what these "Horizons '83" shirts they see everywhere mean.