I don't see EFF attacking people for operating under the current system, so obviously I wasn't saying they aren't trying to change the system at all.

I also haven't seen a proposal from the EFF for a constitutional amendment of any stripe.

"The Congress shall have Power [...] to promote the Progress of Science and useful Arts, by securing for limited Times to Authors and Inventors the exclusive Right to their respective Writings and Discoveries[....]"

It shouldn't require an amendment for the Congress to decide to exercise that power differently or not at all, especially if they realize what's happening now doesn't actually promote progress in new fields without a critical mass of open prior art.

Are either of those feasible? Are there other actions that are feasible, and is the EFF doing those?

Well, the EFF can't really step in to lawsuits between large companies, so it's a bit hard for them to get directly involved.

They've certainly challenged the status quo on copyright law, though.