In the last year, someone shared a comic on Facebook. It showed a grown up Calvin giving his daughter the Hobbes doll to play with. It was one of the most heart-warming things I’d seen in a while, and I hope that Bill Waterson himself would enjoy it. (Turns out that several web artists have worked in that milieu.)
And now, here is an alternate possibility from the “Gritty Reboots” people.