If several countries, distribute across various continents, have managed to put in place three-strikes and six-strikes (not that I think it's good), it means that the one and foremost knee-jerking argument saying "You can't do anything about DDoS because: [X] It's technically not realist" is gone.

Technically now ISPs could throttle the bandwith (or even disallow net access) to zombies boxen used in DDoS attacks in all the countries applying "x-strikes" rules.

So there may be light at the end of the tunnel.

It's not exactly as if DDoS was a fatality and nothing could be done about it.