I am curious why, if they actually believe they have a good chance of success, this is only being filed now rather than in prior years? Has something changed?
You need standing and money to sue. Based on the EFF release:
https://www.eff.org/press/releases/eff-lawsuit-takes-dmca-se...
> EFF is representing plaintiff Andrew “bunnie” Huang, a prominent computer scientist and inventor, and his company Alphamax LLC, where he is developing devices for editing digital video streams. Those products would enable people to make innovative uses of their paid video content, such as captioning a presidential debate with a running Twitter comment field or enabling remixes of high-definition video. But using or offering this technology could run afoul of Section 1201.
> EFF is also representing plaintiff Matthew Green, a computer security researcher at Johns Hopkins University who wants to make sure that we all can trust the devices that we count on to communicate, underpin our financial transactions, and secure our most private medical information. Despite this work being vital for all of our safety, Green had to seek an exemption from the Library of Congress last year for his security research.
They have two people with reasonable reasons for wanting the regulation changed and are affected by it now would be my guess. Oh, and these people need the EFF to cover the legal costs.