Comparing Hogan and Edge
For all intents and purposes, the wind can blow wrong and Hogan will be paralyzed. He isn't involved physically in anything because he can't be, period.
If you truly believe that WWE wouldn't generate cheap heel heat over a retired John Cena's injuries (hypothetically speaking of course) then you must have been watching WWE for only a couple of weeks/months. Edge is far from the first they have done this with, and will not be the last.