To answer a couple of follow up questions I saw (sorry if I didn't see them all):
Most panels are capable of scaling. A couple of specialized or super budget panels do not have a built in scaler (such as some of the popular korean panels).
ANY modern video card is capable of scaling, if you're concerned that your card isn't "modern" enough, ask yourself this question: Does it have DVI or newer output? If yes, it is modern enough. If no, you're gonna need to replace that card anyway for a high resolution digital display.
Again, more pixels is still better. Remember, you are never forced to use all of said pixels. If you want to run a game or movie at lower than native resolution, more power to you - nothing lost - but now you still have the option of running native resolution for productivity needs or older (less demanding) games and future (higher res) movies.
As a side note to the above point, a lot of people use the faulty argument that 16:9 is a better aspect ratio because a lot of media is designed for it. The truth of the matter is 16:9 panels were designed purely as a cost-cutting measure for the manufacturers. Any time that media is locked to 16:9 aspect ratio, you can simply set a 16:10 panel to a 16:9 resolution and turn off the scaler - you now effectively have a 16:9 panel for the duration of said media experience. Remember, people might complain about black bars taking up part of their screen, but said areas of the screen don't even exist on a 16:9 panel - You don't gain anything from 16:9 panels, but you do lose pixels that are extremely valuable for just about anything aside from full-screen movies.
As I mentioned earlier, and was also mentioned by another user, I would NOT suggest using a TV. I would also not suggest going over 27 inches at 1920/1xxx resolution. I've already mentioned why in my first post, but to address the specific related question that I remember - "how can TVs be ok with 1080p at 55 inches?" or something to that effect - There are two reasons. 1) Because TV's are designed to display TV broadcasts, and movies, which vary from 300x200 to 1920x1080. Additionally all TV/movie video is heavily motion blurred, lens blurred, has added noise, etc etc to make it appear "film like" and thus acceptable to the average viewer as "quality video". Anything higher would drive up costs without having any visible effect on currently produced TV media. 2) because you typically sit so far away from a TV that your eyes can not resolve details much smaller than the pixels offered. A 2 square mm pixel is huge and obnoxious up close, but from far away is just barely big enough to see.