Coinbase will give a big boost to whoever is listed. I still remember Ripple XRP went "to the moon" as rumors surfaced that a listing was imminent. Coinbase waited a while and then smashed this dream by a clear comment on its policies.
ERC20 will be different. A grain of salt remains since SEC might still ruin the party by requesting delisting of security tokens. This action reduces the number of possible tokens significantly for US markets.
It will be interesting if EOS or TRX are possible candidates. Though they are moving away from ERC20, I am not sure how far this will be. It might be close enough to stay. Volumes of Tron are apparently high enough to justify a listing.