To be entirely honest with my opinion, it looks like Apple is purposefully limiting the Mac Mini product and making it more limited/less options. Why? Apple wants to phase it out, but knows people aren't ready yet for the discontinuation. So, Apple does the slow, stepping stone approach: downgrade features/remove options, until people no longer want it. Then discontinue the product. It's the passive-aggressive approach of saying "we don't want to sell the Mac Mini anymore, but we also don't want to anger customers yet with the discontinuation of the product, so we'll just make it unlikeable to a point where it'll reduce sales."
If you look at the classic MacBook Pro as another example, Apple is still selling it, but hasn't upgraded it at all since 2012, making it more unattractive. They also reduced the price on the cMBP by $100, similar to what they just did with the Mini. Same analogy, I would think.
The writing, unfortunately, is on the wall.
Or Apple is preparing the Mac line-up for something to slide in between the new "disposable" 2014 Mac Mini and the Mac Pro.