How is that thread related?
Can't say for sure, but I'd expect to wait until Skylake at least for new Mac minis based on the frequency of recent updates. They were updated only last October.
That's quite a thread you've linked there... but it would be nice to know how that helps answer the OP's question.
Totally related….. Within the afore-linked thread there is speculation about Broadwell, and many other Mac Mini related topics besides.
In truth, no one here on MacRumors can answer the OPs question. Any rumour about the future of the Mini is pure speculation, though the new Mac Mini is almost certainly coming.
From the 2014 update, and what we have seen from other Mac arrivals, improved functionality seems more likely than substantially increased grunt and outright performance. Expect something evolutionary rather than revolutionary….. something that is more likely to be of interest to new owners, or those replacing much earlier generations, rather than enticing fanboy owners of recent generations to stump up for the latest and greatest thing.
At this stage, if the HDD of my base model early 2009 Mini failed now, repair would still be my preferred option to replacement. The repair shop would have things sorted within a day or two……..
In a couple or three years, replacement could well be more cost effective, as was the case for my 2005 original, which was (disappointingly) obsolete for my purposes by 2009. However I have a friend with an even earlier G4 MacBook, that still soldiers on, serving his needs even now.