I don't know if this is a "healthy" process. Inevitable it may well be. But it doesn't change attitudes, it doesn't help the people involved and one issue I don't see talked about is that the quality of the language itself seems to drop through this process. "Crippled" has a certain pithiness and is a distinct word. "Differently abled" has many more syllables and verbal overlap with words like "different" and "able". We're shrinking the ability to describe things in a process that might literally be Orwellian.