2.1 - Alternative Materials is key. Something conducting would be nice. We can probably extrude dielectric slurry for later firing.
2.2 - Maybe not ANY thing, but certainly if there's something you CAN make yourself, you are now enabled to do it without the need for an entire company. Technological Unemployment sounds great, but I think we'd need to fix the whole 'money' problem first.
2.3 - How else might we make the printer more intelligent? This is what i was hoping people would brainstorm about.