That's not a doom and gloom prophecy for Intel though, because I don't think the PC market is going to suddenly collapse rather than gradually decline.
I feel like that's what the vast majority of us 'doomsayers' are stating. Clearly Intel relies very heavily on high-margin server/consumer chips, but those aren't going to see much growth in the near future. Some growth in emerging markets, but those consumers are going to be able to afford a tablet before they buy a $750 Ultrabook.
It isn't that Intel is going to fade into nothingness in the next 2 years, but rather their core business is being threatened from below and their margins are inevitably going to take a hit whether they do well in mobile or not. The Bay Trail platform is going to strip sales from Haswell, that doesn't depend on whether it succeeds or not. Ultimately, that's something Intel will have to live with.
It's not going to be business as usual for Intel.
I actually think mobile sales are going to start slowing down much more substantially. $200-300 off-contract phones are becoming more common alongside pre-paid plans non-contract plans
This is where I'd disagree. Smartphones still have another several years of market penetration before they'll have satiated both the stable and proven, as well as emerging markets. What we're seeing from carriers is the exact opposite of what you're suggesting. The carriers are providing more incentive for users for upgrades at an accelerating rate. If anything we're seeing the opposite and should see a higher volume of smartphones in users' hands over the next few years.
http://www.theverge.com/2013/7/10/4510570/t-mobile-to-introduce-jump-unlimited-phone-upgrade-plan
http://bgr.com/2013/07/19/t-mobile-jump-att-next-comparison/
Hardware improvements are going to hit a major wall very soon. People will have a lot less incentive to constantly replace their phones and tablets. People have already had less incentive to replace their PCs for years, although businesses have reacted by only gradually lengthening their upgrade cycles. They're taking a hit from people replacing their PCs with tablets but I don't think the damage from that will keep accumulating.
I do think we'll hit a wall soon, and in smartphones before tablets, but it's an arena that's vibrant and has cutthroat competition. We're currently in a phase in smartphones and tablets where we're getting double the performance of an SoC on the same node within just a year and a half (Qualcomm's Snapdragon S4 > 600/800, Apple's SoCs, and even the bargain bin Android ones via A15 and PowerVR/Mali).
This is a lot like what we saw in the vibrant PC space back in the mid-2000's. Remember when you could upgrade your CPU and GPU every two years and see a huge performance increase? That's what we're getting right now in the mobile world. There's still a lot of room for growth with respect to just what those form factors can do (smartphone + wireless periphery = PC?) as well as performance.
But whichever way I look at it, I don't see consumers suddenly wanting to spend $1000 on laptops or desktops. Those consumers that want a new PC aren't going to disappear, but they'll decrease in number as we move forward. As much as some of us hate it, cheap, prepackaged mobile computing is the future. Device makers are realizing that they don't have to have the cutting edge performance and that the vast majority of consumers could care less what X SoC/CPU scored in Cinebench 11.5 or what the raw GFLOPs of the GPU is. What matters is the entire package and how it's presented to the consumer, and on that side Intel has very little, if any say at all. An additional $50 spent on the display or aluminum body would net you more sales than another $50 to the SoC maker for that extra bump in performance. Intel experimented with this via Ultrabooks, but again those are/were priced too high and offer nothing but a slimmer body at a higher price coupled with worse performance with nothing else.
On the server side, Intel is going to have a harder time selling large quantities of Xeons for cloud computing or web hosting, where dense clusters of microservers offer better perf-per-watt