I think what Microsoft may not be understanding, or may be trying to ignore, is that people aren't buying new hardware because their old hardware meets their needs. In the early days, there were two major factors that drove the PC industry -- (1) low saturation. PCs were a relatively new thing, and there were a lot of people who didn't have one yet. (2) PC hardware and software were in relative infancy -- we were on the steep end of the curve -- and resources didn't meet the needs of what people were trying to do. Software drove hardware in that each new release of the OS needed faster hardware and bigger disks to run reasonably. UI was still on the steep end of the curve, with new features coming out that were actually -- you know -- relevant, and not just eye candy.
All of that is long past now. Microsoft doesn't understand that the UI curve has flattened out, as their recent attempts to make the UI Really Different hasn't met with a lot of enthusiasm. About the time PCs routinely sold with quad core processors and terabyte drives dipped under $100, hardware stopped mattering for most people. What people could *do* with these resources started mattering more than the resources themselves. Hell, I do compute intensive work on a motherboard from 2005 sitting in a case from 2000, (running Win7 Pro) and I have no desire to upgrade anything except perhaps disk space. I do vacuum it out once in awhile.
So, Microsoft tries and fails to develop the hipster mindshare of Apple, so they need to try something different, and they see an over-saturated market, with a plethora of hardware overdesigned for most people's needs (given that "most people" do web browsing, facebook and email and other social media, and maybe a game or two, and perhaps a movie, and that's pretty much it), and decides that's the field they need to go into.
So... wow... I mean,... How is it they're still alive?
Someone I know works for Microsoft, and he's really been crowing about Microsoft's new laptop and how it's the greatest thing since, I dunno, Windows for Workgroups. And I look at it, and you know... it's just a laptop.
In summary, "reigniting the PC market" is problematic because the PC market is already saturated and over-built, and has been for years. It's like, when toasters first came out, everyone had to have one, and growth was steep. But now, everyone already has a toaster, and we only replace them when they stop working. Sorry, that's the nature of industry.
You want to create a new market, make apps for content creation on tablets (as opposed to content consumption) and maybe tablets will see a new renaissance. I don't own a tablet precisely because most of what I use a PC for is content creation, and the apps aren't there on tablets even now.
But PCs? They're toasters. Pick a size and a color.