I don't think it's all Windows 8's fault. The average desktop PC is just too powerful.
I've been using Visual Studio 2010/2012/2013 with an i3 and an SSD for years now and I rarely run against any sort of performance bottleneck.
To compare what sort of performance requirements I have: in the project that I work on I have a solution with 28 projects that takes about 50 seconds to build from a clean build. Visual Studio takes care of incrementally building the projects during normal development, so usually I'm looking at ~5 seconds to build then launch the debugger.
I have absolutely no need to upgrade. No need = no sale.
I'm using Windows 8 as my operating system. It takes one step forward and one step backwards. I'm looking forward to Windows 8.1 but there's nothing so seriously wrong with Windows 8 that I need 8.1.
When I'm sitting in front of my PC and using Visual Studio, I'm not thinking "I wish this was actually a docked tablet". I have an iPad for mobility.
PC sales are probably undergoing a bit of a course correction as people who are satisfied with tablets buy tablets instead of PCs. But I suspect PCs will be around for a long time to come and, until that day, there's nothing for them to "[come] back" from.