A widespread myth of sensor resolution (or the end of the megapixel race) states that if you print larger, you will step back further and, consequently, will never need the resolution given by higher megapixel cameras and prints. This myopic view of megapixels is correct if you are thinking of snapshots, looking solely at web uploads, or preventing* people from getting close enough to inspect the images.
* Helmut Newton’s big nudes are hung above the stairs in the lobby of the Berlin Museum, where it is physically impossible to get closer than about 2 meters, to realize that they are really not that sharp.