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Hello ! (sorry for my mystake, i'm french ;D )

I own a 5d2 for the last few years. I bring it everywhere, everytime to capture my daily life. But it missed a lot of functionality. I have a sort of hate/love relation ship with him.
So i just buy a new 5d3

Now i'm not using the 5d2 anymore. But i love it!
Should i sell it or just keep it ? maybe i would love to re-use it in 5/10y when vintage photography will tell us to bring-back to life our old camera ?

What do you think ?