I personally couldn't care less about a new Mac mini, but I'd appreciate them finally upgrading it.
There is a reasonably large niche that desperately wants one and Apple has probably already lost a substantial amount of it.
I think many of us are sitting on our previous gen (pre-2014 upgradable ram/storage) Minis, hoping for at least Quad-core and 32GB (BTO) ram and TB3 (fast ext storage and GPU support) to be available.. at some point? (going back to upgradable ram and storage would be nice, but won't hold my breath)
They're plenty good for what we're using them for, but will begin to die at some point. Just replaced the power supply on the one I have in the entertainment center (again). The mini at the office used for network backups is still humming along nicely.. (knock on wood) Will upgrade both if Apple announces what I've been waiting for... Otherwise, have a hackintosh parts list put together on pcpartpicker that will probably become the entertainment center Mac Mini next year.