Au contraire. Power Rangers would certainly be more Disney-esque than 5 golf courses, James Cagney on the Movie Ride, or belly dancers in Morocco.
Disney's runaway success with "Princess" merchandising (and reflected on property by the demand for CRT) should hopefully get Disney to realize they're missing a huge market for similarly-aged boys.
I have two boys (5 and 8) who, sure, are excited about the rides at Disney; but there really aren't any characters that appeal to them. Buzz Lightyear may be one exception. But my boys, and most boys their age are more tuned into Power Rangers, Spiderman, Hulk, etc. Disney has never tapped Buzz's superhero potential, and that's what young boys want.
Other than Buzz, name an attraction at Disney that's really aimed at young boys. The only one I can think of is Tom Sawyer's Landing. And that was before MY time.
We're DVC members, plan on going to Disney every year or two for many years to come. But I can tell you that the pinnacle of our upcoming trip is going to be at US/IOA.
Now, if they had a Power Rangers breakfast and ride, that might change.