""The person is disabled" will be found to be non-PC."
I'd guess sooner than you suggest since I see special Olympic folks saying that now they are just like everyone else, so the goal might well be to have no name for their condition cuz they are just like us.
For these terms, the more they enter common vernacular, the more chance they develop unintended meaning that may be inaccurate or even derogatory. The term "handicap" is developing some meanings that are making it less desirable for certain medical applications. Disability may soon head down that road as well.
As someone in the medical profession whose job requires that I not unnecessarily offend my patients, it is difficult to keep up with the latest trends. This includes disability, racial and ethnic terminology, gender and sexual orientation and substance use among other things.
Language is a dynamic thing even though we would rather it stay static during our lifetime to avoid confusion and make life easier for ourselves. But by not keeping up with trends, we may in fact be making life harder for ourselves unnecessarily. At least in my case this is true.