actually that's a really good question and one i've been thinking about a lot. the thing is that after last year's jumbo 36-artist art telephone, i started joking and then not-so-joking about next doing a frankly irresponsible 72-artist telephone, and then i offhandedly mentioned that at some point in the future i'd probably make a post advertising for artists for such an event, but the response just to that comment was so overwhelming that not only did i not have to make the advertisement but i also had to turn away probably a couple dozen people after the roster filled out.
i think that once the current gigaphone is over (we're currently 45/72 of the way through), well, a couple things. first, i'm never doing one this big again; it's gonna be fucking crazy and awesome once it's finished but the year-long suspense is torturous and wrangling this many artists is truly like herding cats. second, i'm not sure if i'll publicly advertise for any future telephones just because i've got way too many eyes on me now and i don't want to have to reject a ton of folks again. honestly i don't know yet how i'm going to put together future art games, though i'll probably keep it to just friends and mutuals.
so unfortunately the final answer to your question is i don't know! at least if we're talking about an art telephone game run by me. but the thing is that anyone can start a game of art telephone! i was first inspired to arrange one after participating in one of @psshaw's. if you got a few art buddies and they each got a few art buddies then you can put together a game, or you can always publicly advertise for one. hell, i think that if someone was feeling entrepreneurial, putting together an operation like Art Fight but for arranging and facilitating art telephone games would be a pretty rad thing for someone who isn't me to do.