If you were hoping to buy some coins on discount today than Coinbase is the wrong place to go. They have temporarily halted transactions on 2 of their 3 offerings. Both Ethereum and Litecoin are temporarily unavailable as offerings. However if you feel they need to acquire Bitcoin that is still a viable option.
If Coinbase keeps disabling transactions when the market has a significant drop.... is it really a viable option? High risk should entitle those to an opportunity to gain high rewards. Hopefully Coinbase figures out how to scale (and run more efficiently) as their users and the markets fluctuate.