I all depends on what you use each device for, and if it has a niche for that use. I have three tablets at home:
The G-pad is the daily use one as I use it for work, commute entertainment, and reading smaller page size comics (manga) and books. The size and portability is perfect for this, and I expect future daily driver tabs to be in this size range.
The G-Pad replaces my Acer A700, a 10.1 tab which is still used daily as my home browsing device, plus as a media player to my various TVs in my house thanks to the micro HDMI (I have one slimport adapter for the G-Pad as well, but several micro HDMI cables, so the A700 is used more frequently). I also still use it to read larger page size publications (i.e. American comics, magazines). The A700 is too big to tote around comfortably to work, though it was invaluable on our vacation days to entertain everyone. Haven't brought the laptop with us on vacation since we got the A700 or its predecessor the TF101.
Finally, I have a Samsung Galaxy Player 5.0, which used to be my commute entertainment device. Nowadays though my four year-old mostly uses it to watch My Little Pony and so on while on the road. I also use it to listen to music while working around the house, as it'll slip into my pocket easiest of all.
All three devices complement my work-provided iPhone 5, which I use for phone and email, and browsing when I don't have a wifi connection. As it's a work device I can't jailbreak it to make it more functional, and I can't stand browsing on it unless I absolutely have to. I would just as happily use it exclusively as a hotspot if the damn battery would last longer.
So in my view, if you have specific uses for each device you have, then they will continue to be used. If not, then selling it would be an option for you.
Mark