I really want a new, top spec Mac mini... my money is here if you want it apple.
I'm afraid the problem is that not enough people are interested in buying a Mac Mini.
Let's face it, how many out of a hundred would buy it? Most regular Joes these days want a laptop, maybe an iMac which is convenient with everything included (mouse, keyboard,screen, sound, etc).
People now want convenience, not being able to customize. I used to be like that as well, but now I buy a laptop, keep it 5 years, sell it second hand for a reasonable price and buy a new one.
The Mac Mini is a niche product, and probably does not create enough revenue to warrant further development, or even production. Please remember that even if something still could be profitable, a company is not gonna pursue it if the same investment of time, resources, talent, and money could be even more profitable when used towards something else.
Would you buy a Mac Mini? Yes! Would I buy one? Maybe?!? Would even 5% of who walks into an Apple store buy one? Sorry, but the answer is no.