I'm curious to hear other's thoughts on they think would be useful.
Please don't hold back ideas! There's very little harm positing silly or unlikely ideas, but there is some potential value (perhaps more than you realize).
Inspired in part by calebo's comment here
I don't know if this is what you are envisioning, but check out Blue Ridge Labs - they do a fellowship where they get techies to apply to an 'incubation period' focused on solving a social issue and teams form during the initial discovery phase. Many startups get major funding and are profitable.
Could be a good format to follow.