I've been reading all the comments on Twitter also... like "err mai gawd I'm switching to AWS because of this" and your failure to not have a secondary DNS provider, but I highly doubt you'd switch.
Then another... "Today's @digitalocean DNS #outage is a reminder to not trust your entire business to one provider. Spread the love around!"
If your company is e-commerce and makes money by being 99.99% available. It's your own fault for no fail-over.
another... ".@digitalocean that's two hours without DNS now...my company's websites could be losing thousands of £ in e-commerce! Please, an update!"