Ok so heres an idea.
A group of people get together and make a page, holding collective art of their own from nowadays. They can be characters interacting with one another, samples of their comics, drawings of objects, whatever. We all put it together on one giant page, then we write our names on the bottom, and the names of our comics. Then, all participants, and anyone else that wants to, can take this page, and make it a “time capsule” set to a certain time that we specify. That is, anyone who has a comic here and joins updates the page to their comic, but set it to “go live” on the day in the future that we specify. Then on that day we are reminded of the project, who we worked with, what our art looked like way back when, and maybe can read a little message to ourselves from the past that we can write in the “Authors Comments” section of the page.
Just an idea I had.
Yell at me if it's dumb.

I think this is a great idea, though we would need more people if we were to make it work.

I'm sure if more people want to do it they will post in good time.

They just have to see it first.
And don't forget, even if you wanna just throw in something little for the page we would still include your name and comic on it.

(It's kinda like advertising for each other in the future, if you have a business-oriented mind)

I'm in. But how long are you thinking in the future to set it to release?

Maybe in half of a year, a year, something like that. Far enough in the future that we might have forgotten about it by the time it surfaces, but not so distant that we likely aren't writing comics anymore.