edit: on a closer look, it think it's the blue background that is the bigger issue than the small font per se. The bits on yellow background are significantly more readable.
edit2: turning all the machines around here, I think the font size has stayed same over time (xp-vista-7 represented here). It doesn't really look like the font on 8 is significantly reduced in size either
To be honest, I can read it just fine without leaning towards the monitor. However, I understand it can be an issue for people with poor vision.
Does anyone know the coin in the picture, that is, the exact diameter of it?
Looking around me, I see plenty of super fine print on products, like lists of ingredients etc... there seems to be a real problem here. I never really notice it myself because I am shortsighted, so small writing at short distance is no problem; but I heard there are people who are farsighted or have even crazier problems, and while I would be fine if nobody on the planet could install Windows 8, I don't think it's okay that many people could not find out what is in the food they are eating without help, even if they wanted to.
17.91 mm (0.705 in)
http://en.wikipedia.org/wiki/Dime_%28United_States_coin%29
I'd guesstimate that the the picture is about 10px/mm.