yeah they survived with the 1 socket approach for a long time. The best was and still is the backwards and forward compatibility of the AM socket series. Example. My last board was an ECS 780g black edition. It was AM2 when it released. After a few bios updated it could support AM3 cpus. That is 3 generations of CPUS on one board. AM2, AM2+ and AM3. I upgraded cpus 3 times and was on my way to the 4th when my PSU killed my board.
I started with a X2 4200+ (AM2) then upgraded to a 9850 X4 (AM2+) switch to a 6400+ BE X2(AM2+) and was about to get the 1090t (AM3). You dont get that kind of compatibilty with Intel. New cpu new board most of the time.
To be honest, it surprises me that AMD are always trying to reverse engineer their chips. I like that they try to retain compatibility but they lose flexibility on their dies.
If they’d allow more frequent socket upgrades, their chips could in turn be more powerful. Piledriver is confirmed to use AM3+ just like Bulldozer, which puts me in the camp of “it’ll suck just as hard.”