Although I wouldn't put my family on a 787 right at this minute, the reality is carbon fiber and monster batteries are what's next.
Some of these systems are 270 VDC. My dad an I used to take bets on which one of these new 48 VDC systems the military is getting into would be the next roman candle on the ramp. The dielectrics on a high voltage DC system show creeping and channeling over time... and the reason isn't fully understood yet. We will get there, but so much of this stuff is just so crazy and new it's like a flying science experiment. I get so pissed at Boeing for taking this "new" field and running with it WITHOUT taking the steps toward a quality control model that makes sense, and every time something slips through I don't see them to crap to fix it. I'm not saying anyone is going to be blowing any whistles like the stupid Eclipse jet, but there were trembles in the force for years and Boeing just shoulders through it- because if you act invincible, magically you will become it.
I love looking back, at ships and airplanes. Ships, wood only dammit! Then fiberglass came around and everyone scoffed- then it took hold and now almost everything is glass. Then carbon fiber, well that's only good for racing vessels, except it's not.
Wooden airplanes, then aluminum airplanes, now composite airplanes. Bill Lear and the LearFan... Bill Lear the best thing that ever happened to airplanes and science since I don't know when. Olive Beech and her team of engineers (yes even the outsourced screwball Rutan) with the Starship 2000. Twenty years later, Liberty's, Cirrus's, and the 787. What a compressed time scale compared to ships and probably because of Bill Lear more than anyone. Somehow, 50 (maybe 60) years from now my grandkids will be looking back at me saying "Wait so... you guys had aluminum airplanes back then?- Can that even fly? Only 2 batteries? I don't understand!"