Olympus XZ-1 AMOLED screen etc.
Do you have any source of information about OLED life expectancy other than a random web post?
Other random(!) webposts from 2009 I find via Google, talk about 50K hours lifespan. The Wikipedia article talks about (experimental) blue OLEDs in 2009 having a life-span of 62K hours. All Wikipedia references talking about breakthroughs in OLED life-span are from 2, 3 years ago. It sounds safe to assume that some of that tech has already found its way into products like the XZ-1.
Phone Arena talks about blue OLED pixels having a life-span greater than 30K hours. Now if you use the screen of your camera 8 hours a day, every day, a 30K of life-span would give you a camera working for 30000 / (8*365) = 10 years . (are you going to use your XZ-1 display 8 hours a day for the next 10 years? I think not. What about 4 hours a day for the next 20 years?)
If you care about it display power consumption, OLEDs will use less power for most images . If you care about the power consumption of the XZ-1, try reading the XZ-1 review, where the consumption under actual usage is reported.