'why do things gotta change'? Actually, that's quite sensible. Benches have shown that the two only areas where Barcelona kicks Core2's butt is complex arithmetics and memory management.
It would thus stand to reason that grid servers benefit most from Barcelona - a woman with great boobs and knotty knees won't hang out in a big sweater and a miniskirt...
Look at it this way: K7 and K8, which were in the same situation (very strong arithmetics capabilities) kicked Intel's butt something fierce in the desktop area at the time, not because K7 and K8 were also good all-around chips, but because Intel's product offer of the time sucked.
In what case do professionals change a computer's processor? Answer: in servers, where the platforms allows for minimal interruption on such operation (many UNICes allow for CPU hot-plugging, Windows can't even dream about it), which helps explain AMD's current focus on backward and forward compatibility in their socket and chipset designs.
The fact that only enthusiasts change CPU in their machines, and that such a market doesn't represent more than a single digit percentage of the consumer market, should show iclearly that Barcelona was never designed for that market (the last AMD CPU specifically designed for that was the K6; Duron and Sempron don't count as they were hacked down versions of the more powerful K7/K8 cores).
Long story short, I find normal and sensible that AMD focuses on high performance grid computing as a market, instead of enthusiasts, which by nature is very volatile.