i used a 32" TV as my main display for a while, and it worked pretty well... not good enough for FPS, but for moba/rts and some action adventures it was fine.
i remember 32" was already overwhelming and i had to move back from the desk as far as i could or id feel a bit like im in a solarium hahaha
50" must be sick... if you like it and the PIXEL response time is alright, see if you can mount it to the wall and move your desk away from it maybe?
but if youre into FPS, def swap it for a high refresh rate monitor, once you get used to it theres no going back, everything is so much more smooth and responsive