I obviously hope they don't, but at this point I won't be completely surprised. You said- "I'm glad Disney responded quickly to this issue without having to have temporary chain link fence lining its shores." That's where I will respectfully disagree with you. I see a horrible, horrible tragedy that happened. Not an alligator "issue".
Does anyone know at this point if they are planning on creating a barrier on all of the water areas throughout WDW? Or only the areas with a beach?
But it is an alligator issue... That horrible, terrible incident occurred because alligators inhabit just about ever single body of water in Florida, including those in the magical bubble called Disney.
So short of eradicating every single alligator in the 27,000 acres that comprises Walt Disney World (which quite frankly would be impossible to do and would not be allowed by either FWC or FWS), Disney is improving its signage and putting up barriers to prevent people from entering the SSL (and I assume Bay Lake also).
Because the REAL issue is human encroachment on/destruction of the habit of a pretty efficient predator.