I have to say, I like the entire appearance of 10.10, as it is now, in DP1...That includes the folder icons, and even the blue in the finder icon in the dock, exactly the way they are, now, in DP1.
Plus, according to the info on this page:
Code:
http://en.wikipedia.org/wiki/Aqua_(color)
Apple are now closer to 'Aqua' than they have ever been!
That being said, I don't have eyesight problems, and have no need for spectacles...Make of that what you will.
Finally, at least now, for the first time since the initial OS X Beta, the shade of blue Apple have used, is uniform and identical, across the board: The blue in the Mail app icon is the same as the blue in the Safari icon, which is the same as the blue in the App Store icon, which is the same as the blue in the Finder icon, which is the same blue as the Messages app icon, which is the same blue used in the icon for the folders, which is the same blue as used by MACRUMORS in their question mark post icon!!!
Now, if that, in and of itself, isn't a case for the current blue, then all those who dislike the new blue, may want to go the Windows route, and NOT UPGRADE, in the desperate hope that the next release - Presumably OS X 11.0, will be the saving grace, for those who dislike change!