not before ADA : )
ADA will be added but it will take alot of time and engineering since ADA is on it's own chain, I would estimate that between the 5 coins coinbase said it would list (ZRX, BAT, XLM ZEC and ADA)
that ADA would be last among them.
It will probably go like this
1.ZRX
2.BAT
3.Zcash
4/5. XLM or ADA
What you think, will BAT be the bext coin Coinbase will list on their exchange?
Nope, there will be much more other interesting ones, like EOS or IOTA, listed before. I don' know if it requires some money to list on but I'm sure they won't list little shitcoins. What are you talking about dude? Have you even kept up on the coinbase news?
They dropped this in July basically saying which coins they would list:
https://blog.coinbase.com/coinbase-is-exploring-cardano-basic-attention-token-stellar-zcash-and-0x-9e44f0eb823f
Notice that EOS and IOTA both are not mentioned on there
The next coin will 99.9% for sure be BAT
Why?
Because BAT is an ERC-20 token, same as ZRX, it will be incredibly easy for engineers to add it.