I just hope one day there will be a single tech that allows us to play a console game on a PC and vice-versa, I don't care about the monopoly aspect because anytime a single item comes along that unifies things for our convenience the "we want freedom" brigade start ringing their bells
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Choice is not always good, that is why the tech industry is full of things called "standards" which run across everything from networking, ports, connectors - hell can you imagine the chaos of USB flash drives having different shaped plugs depending on who you bought it from?
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D3D can be used on Linux, so it's not a springboard for forcing Windows uptake and anyone that uses Linux knows this, Linux is a hobbyist OS at best for the desktop and even Gabe's Linux based Steam Box will not drive uptake of Linux, he already said Windows could be installed on it and Steam users are the fastest adopters of Windows 8 - check Steams own stats if you don't believe me, they are casting aside ALL VERSIONS of Windows to upgrade
http://thenextweb.com/apps/2013/02/02/windows-7-drops-below-70-adoption-on-steam-while-windows-8-passes-windows-vista-and-ubuntu-grabs-1/