according to last Coinbase twitter poll, or responses from users rather, when coinbase asked which coin should be added AFTER EOS was already added to coinbase pro, well Steem was the next biggest group of users on twitter representing their coin.... I am pretty sure that since Steem has no more competitors as theyve all been Added to coinbase already, Steem is going to be next....

Coinbase has EOS and a few other DPOS coins already so it should be no problem to add steem

Exodus crew have also expressed interest on twitter to add steem to exodus, it will take a clever work around for new accounts maybe will have the ability to add keys like vessel, but EOS was worked out on Exodus with a button to unstake, but not to stake... exodus with steem will also be really nice. Steem on coinbase and exodus could be bigger for steem than we realize. Coinbase SHOULD honestly be adding it next if their twitter comments are listened to and I think they are.... Maybe even bitshares on coinbase after steem imagine that...