That's not going to happen. Currently most of the IT-type industry is another "copy the living daylights out of everyone else" phase. At most the successor to Win 8.1 will have a couple more nods (like Win 8.1's Start button) towards the non-touchscreen-crowd because that's what business/serious users will desperately want, but that's it.
I think we have to look at it from Microsoft's perspective, and then figure out a balance that would work.
Microsoft wants to corral you into their controlled ecosystem, that's by FAR the #1 reason they have the Metro/Tile world side of thing to begin with. It also is true that the traditional Windows desktop is a terrible interface when you're dealing with a touch-centric device.
However, the tile world is pretty crap to navigate with a keyboard, mouse, and non-touch display. Further, touching your desktop monitor is impractical at best.
I've configured several Surface Pro and Surface Pro 2s for clients, and it actually works fairly well there.
Anyway, the software is just not there yet for the desktop market. Too many apps and even cloud apps are just garbage to deal with with a touch interface, so the only truly efficient way to deal with them is with a keyboard and mouse (Excel, QuickBooks, Salesforce, ACT, Timeslips, Photoshop, etc, etc). Not only is it unlikely that touch/tile versions of these will be as functional as the desktop variants anytime soon, but there aren't credible alternatives to these for corporations that rely on these apps as core functionality to get stuff done.
Now beyond that, you also have users multitasking quite a lot. At each of my client sites, the typical user is running several web tabs, often in multiple browsers, along with Outlook (Office 365), a handful of office documents, a cloud file browser, and some random apps that are specific to their job, such as QuickBooks or Photoshop. The Windows 8 and even 8.1 standard just doesn't work well for these people with a default configuration. Every care has to be taken to prevent them from being thrown into Metro, because it causes all of their work to disappear from view.
So the problem is how to have a hybrid OS that serves Microsoft's financial goals without making things hell for their most stable customers : the business world.
I'd propose a 'desktop mode', in which you could launch and use Microsoft tile apps from the desktop. Movable, non-full screen, resizable, and not ludicrously inconvenient. Hilarity ensues when a heavy desktop multitasker first launches a PDF file in Windows 8 (quickly combined and then replaced by extreme anger and much cussing at the IT department). Giving them the option to exist in the same workspace as traditional apps would solve this problem. A good or great app would still sell just fine, Microsoft gets their cut, people could also use them in 'Mobile' mode with the full screen Metro interface, and so on. But it wouldn't 'break' the traditional desktop workflow, which is incredibly efficient for these users.
Also in 'desktop mode', you'd have the option set by default to having a PARTIAL (maybe 1/4 of the screen by default!) Start screen, which also doesn't cover the taskbar up.
The combo of that would really really sell. The people who love the way it already is could set it that way (Call it 'mobile' and even make it the default setting if they want). The people who are heavy desktop business users could have their systems (the ones that currently sell with Windows 8 Pro, sold or leased in bulk to corporate customers) default to the 'desktop' mode I've described above.
Problem solved, billions made Microsoft can send me their check
In all seriousness, if I had just described Windows 8, Microsoft would have had a HUGELY more successful time with the OS, making quite a LOT of additional profit.