Space is a premium in many people's homes. Games and game consoles take up lots of space. I decided to keep the Game Gear and Genesis from my childhood, the PS2 to keep playing my PS1 and PS2 games and then have the PS4 and PSV. I'd have sold the PSV had Uncharted Golden Abyss been in the PS4's Uncharted collection. I've used the PS4 to condense my favorite PS3 games into the library; buying most of my favorites as remasters. All other systems were sold as my favorites were brought to this gen. An example being the Shenmue HD collection coming to PS4. I sold my Dreamcast once it was announced.
All my older systems are now condensed onto a Raspberry Pi that looks like a mini SNES. NES, SNES, Sega CD, 32X, Game Boy, GBC, GBA, Atari, N64... etc... etc... Everything condensed into 3" x 4" x 1.5" space. It's a smaller footprint almost any of the systems by themselves. Eventually, if there are updated Raspberry Pi systems that have Saturn (for some reason not emulated on it), PS2, Xbox, Dreamcast, and up to 360, PS3 and Wii, I'll buy that Raspberry Pi as well as it will grant me access to favorites in a condensed space. It's incredible when you think about it.