SDN, the all powerful solution.
To be fair, yes, SDN could be a possible solution to DDoS attacks. Not quite sure why this is being aimed at users and orgs though? Surely, shared "DDoS tables" would have to occur upstream, at the ISP level. If your pipe is being saturated, it's not going to make a difference which of your routers know about the attack, you'll still going to blackhole most of the attack packets along with a decent portion of legitimate traffic. Now, if attack data was propagated from the ISP to the end user...that is a different story entirely.
I for one welcome our SDN overlords.