Originally Posted by wizard69
First off we don't know what the actual density would be on an iPad Mini.
You think they'd double the density on everything else, including going to the trouble of using the same resolution as the iPad 2 and PPI of the iPhone 3GS just to muck it all up for the Retina iPad mini by not doubling to 326?
Second the various devices on the market, from the iPhone on up to a retina MBP demonstrate that high resolution screens aren't an issue anymore.
The yields of the MBP are much, much lower than iDevices. They also command a much higher price tag and not budget devices.
The only way that I could see yields being a problem is if they where about to enlist new technology that isn't currently in mass production.
Again, consider what I wrote, especially the last line. If you have an argument that shows how Apple was wrong to introduce the 163 PPI iPad mini when they could have gone with an entirely different panel density so that it wouldn't overlap with the iPhone and iPod Touch when they wanted to go Retina then by all means state it, but so far I see no valid argument as to why Apple wouldn't do a 2x scaling for the iPad mini after the iPod Touch, iPhone, IPad, and MBPs have have all gotten them.
Personally, I think Apple planned for this eventuality and think that many things are lining up properly to give up a Retina iPad mini this year, albeit not with the same SoC stepping they did with the 10" iPad, but that's not assertion of what will happen and isn't in any way ignoring the multiple factors that have already been stated regarding costs and yield variables.