Do MacBook Pro displays degrade over time? I work on MacBook Pro (15", mid 2010) pretty much every day for at least 8hrs. I remember my previous (non-Apple) laptops displays used to darken over time. Should I expect something similar happening to my MacBook Pro?
I have had a MacBook Pro since early 2007, and the display is as bright and crisp as the day I bought it. I've also had an iBook G4 since early 2005 and there's no problem with its display, either.

I doubt you'll have any problems for quite awhile if at all, as newer models tend to have better displays then older models.