BD may not beat 2500k/2600k, esp. not overclocked vs. overclocked, but it's not reasonable to call this the end of AMD. For starters, there is still Llano and Trinity is going to launch next year. A lot of computer users don't need top-of-the-line CPU performance. When it comes to the overall package, Llano does offer something attractive for a budget laptop gamer.
Secondly, I can see BD clocks scaling rapidly as 32nm process matures in the next 6-9 months. Prob. 4.2ghz/4.5ghz Turbo for FX-8170 in Q1 2012 and 4.5ghz/4.8ghz Turbo for FX-8190 in Q2 2012. If BD reaches those clocks fairly quickly, it will become a very fast CPU for multi-threaded apps since lets face it the majority of the market doesn't overclock.
Right now, it seems very underwhelming, but so did Pentium 4 @ 1.6ghz vs. Athlon XP1600+. Eventually Pentium 4 scaled way past 3.0ghz. Then once 22nm comes on-board, we may see a 12-core BD @ 4.5ghz+. Maybe we may even see a 10-15% performance increase if Windows 8 has better core/thread management. I don't see BD being the uber chip, but down the line I can definitely see it competing in the $100-200 arena.