It'd be really nice if SE built a solo 'practice mode' for Savage-level content, something that put you into a simulated sort of experience (maybe one without damage being dealt) so that you could practice the mechanics until you got it right. Or, hell, even a 'practice mode' that people could form parties for, that did trivial amounts of damage but instead gave pass/fail grades on mechanics and repeated them as necessary until everyone figured it out. There's a lot they could do, albeit it'd require a nontrivial amount of effort from the development team.

That said, I think it could open Savage up for a lot of players. I know I avoid Savage because involving other people in my learning stages is something I find quite stressful, even if the party is set up for precisely this purpose. It'd be interesting to see how many players would embrace the harder content if it were just a bit more comfortable for them to learn...