I'd like to see a SO clone that has a subscription model that's optional but then when you upvote something you're giving that person some SO cash which they can cashout or apply to their monthly subscription. Subscriptions would be a 'name your price' model, site would take like 10% + 2.8(stripe fees). Questions would drop off indexes, related questions, etc after 1 year - but remain visible for 3 years, moderators…
Something like experts-exchange.com?
Except unlike Medium there is no paywall. No limits on views/etc...