So, Ripple is now the second largest crypto-platform in terms of market capitalization. However, Coinbase will not be adding support for it...yet. Although the company didn't explicitly mention Ripple, it did issue a generalized statement that it will not be supporting any more assets on its platform yet. We've already got a bunch of newcomers like Stellar, TRON, and Cardano that it's getting hard to keep up.
It just might be a good idea if Coinbase took its time to carefully evaluate whether it should add support for a particular coin or not. It might stand to lose in the short-term by not adding support right away, but it's better to be safe than sorry. Plus, haste makes waste!