Yeah, exactly this.
Intel has really stumbled on fabrication the last 2-3 years, but the idea that they won't correct that ignores decades of precedent.
I'm an AMD fanboy from the K6 days, and I love what Lisa Su has been able to deliver for them, but if it wasn't for Intel's stumbles, they would still be single digits at best in most markets.
Look at their progress from Pentium 4 to Core 2 Duo (makes me feel real old to see that was 15 years ago). We probably won't see quite as dramatic an improvement over the next 3 years, but I'll be stunned if AMD still has the performance lead at that point.
Apple's a wildcard, but they aren't going to sell their chips, and they represent a fairly small part of the PC market. No other non-x86 chips have made even a tiny dent in the PC market, and even in the datacenter, it's still mostly x86.
The absolute worst I can imagine happening to Intel over the next decade is that they no longer define the CPU market. But that's a long, long, way from dying, and will probably be good for the market and good for Intel in the long run.