teamninja :
Where are those 4 cores Q3? Regular people simply don't need that many cores
It is called maximizing margins.
AMD has a finite number of wafer starts available to it. I'm guessing the bulk of its CPU wafers are on 8C16T at the moment and will remain there until supply exceeds demand. Once that happens, AMD will launch the 6C12T variants based on the same die with cores disabled to sell excess production to people looking for lower price points. We'll only the the 4C/4C8T variants after AMD has fulfilled the initial demand inrush for higher-end, higher-margins parts.
As for people not needing more than four cores today, a lot of it is down to the chicken-and-egg problem: most developers don't want to put any more effort into designing their software than necessary, which means they rarely bother trying to thread their code any more than absolutely necessary when multi-threaded CPUs are still relatively uncommon. With Ryzen raising the budget bar to 4C8T, making 6C12T becoming affordable and Intel likely to follow several months to a year later, more heavily threaded software may become significantly more common over the next few years.
Ryzen offers a disruptive change in bang-per-buck after six years of PC market stagnation. Only time will tell how much of an impact this will have on everything else. Everyone who uses a PC will be affected to some extent sooner or later.