I have a dedicated room with a 50" Panasonic plasma with a PC desk and monitor right next to it.
There's no argument KB+M offers finer aiming precision in games, but with quality wireless-everything peripherals available these options are no longer limited to a compact 'PC desk area' as they were in years past. Neither is PC gaming in general. High end SFF and HTPCs are why 'PC gaming has m̶o̶v̶e̶d̶ spread to the living room'. Common display connector standards (HDMI/DP) across the industry means you can hook a PC up to any modern display in your house with the same cable. Digital signalling allows long cable lengths that extend through walls/roof space into other rooms with a wall socket without signal loss. Wireless and Networked display signals aren't exactly pro gaming standard to put it softly, but these do have a future also. So even a full tower PC under your desk can be hooked up to a TV elsewhere simultaneously.
TVs are in lounge rooms; bed rooms, man caves, basements, sheds/garages etc more than just in a busy living room. Do you really need a desk in all these places to be a PC gamer? I think polls like this are more so subtle arguments for control preferences (KB+M v Controller) than what type of PC gamer you are. The modern gaming experience is highly adaptable. I'm not evening mentioning the merits of either technology or non-gaming uses. High end monitors can be excellent, high rez, high Hz, low IL competitive weapons. TV setups are mostly bigger, can be HUGE, have superior IQ (Plasma/OLED) and be loud centerpiece experiences that more than one person in the room can comfortably enjoy. It's very easy to enjoy both these things as a PC gamer.
Anyway, personally... I game on my plasma where ever possible for most single player experiences. Most console ports with a controller but older games with KBM. I sit about 2 meters back on a cinema lounge. Witcher 3, Crysis 3, GTA V - just beautiful on the big screen, especially downsampled. I won't change my plasma until 4K OLED is affordable as the IQ with LCD (black levels, motion blur) is simply not up to standard for me even with 4K. For RTS games or shooters that require split second mid-air 180's, I'll sit at my desk with a serious look on my face and mouse in hand. Really looking forward to a decent selection of adaptive sync monitors next year. Keeping 60fps locked at high settings is getting harder.