I always sell off my old consoles if I don't use it anymore.
Infact, the only old console I still own is my PS2, cause I still turn it on and play from time to time.
Sold off my gba sp, ds lite, and Xbox 360. I'm also about to sell off my original 3DS.
I don't like owing more than 3 consoles at a time.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.