Design a automatically distributed database
Consider CloudFlare's new durable objects (https://www.cloudflare.com/cloudflare-workers-durable-objects-beta/), which are distributed objects with storage that can also connect via WebSockets. Consider this as a basis for designing a fully distributed database: i.e. all the smarts of HarperDB + a fully distributed database:
Relieve developers from worrying about location and having to devise complex replication strategies.