Without wanting to get into arguing about how these statistics are calculated (and the one above is from January 2014, before Microsoft ended XP support ), I would however ask how anyone could know what OS is running on a computer used only for audio and not connected to the internet?
Such statistics – apart from the fact that nobody is sure how they’re calculated – might not be all that relevant in this case anyway, because I think the primary market for this lies with those who are looking to move off 32-bit XP and find the only option is a new computer with (probably) Windows 8, or an even more expensive and disruptive move to OSX.
Imagine for example you were on Cubase 5 on XP 32-bit using capable hardware, and you wanted to get off XP, move to 64-bit and upgrade to Cubase 7.5; now, imagine you could download an ISO with an optimized version of Linux, with Cubase 7.5 pre-installed, that you could pop into your existing PC and install, all for only the cost of upgrading the license?