I disagree. AMD had issues with their native quad-cores due TLB errata which pushed back their server and their desktop parts and caused them to miss their targets and when it was released it took a performance hit. Sure there were later revisions and steppings that fixed the TLB errata but it came much later than it should have. Nehalem was an interesting time but it was not released after Intel abandoned Netburst. It was released with Bloomfield in 2008 for HEDT and then with Xeons in early 2009.
Intel abandoned netburst with their core architecture, which made their cpus roughly competitive with the opterons, but they didn't scale worth a darn in the server space because they were still using a shared bus architecture. With nehalem they introduced QPI, which was their answer to HT and which combined with AMD's delays shipping quad core server parts effectively pushed them out of the high-end server space for a generation and they were never really able to catch up. Yeah, they pretended that barcelona wasn't a fiasco, but the reality was that vendors couldn't get the parts they needed in quantity and intel was right there promising huge gains and quantity with nehalem. Before that stumble amd had more than a quarter of the high end server market (which is incredible to remember, compared to where they are today) and after that it was a downhill slide.
AMD has the resources to do it with AM4. There is Bristol Ridge, Summit Ridge, Raven Ridge, and finally Naples. That's already several lines from HEDT to servers to APU's.
And their market share is pretty small, and they're not particularly compelling parts. Maybe vega will finally find a market for high-end integrated GPU, but right now intel has a better story for low end integrated GPUs, higher end but low-power integrated GPUs, and nobody doing high end graphics does integrated GPUs at all. So yeah, they have the resources to make some stuff, but they don't have the resources to spread their efforts around and still make really compelling stuff that people want to buy. Ryzen is their latest attempt, and it looks good, it just remains to be seen whether they can keep pushing or whether they get distracted and stumble.
The interconnects you are referring to is known as "infinity fabric" which is a HT replacement and successor.
What you're talking about is something different (and late; they were talking about a 16 core zen + integrated greenland gpu as something to be shipping last year). I'm talking about the torus interconnect stuff they bought seamicro for, before exiting that business. Even though they both use "fabric" in the name there's probably not much (if anything) that they actually got out of that deal that they're using now.