Instant dapps - paste, tick the functions of smart contract you want to interact with, publish.
Product idea heavily inspired by the oneclickdapp.com.
Self-contained, customizable, embeddable widgets that provide easy to use interface for any smart contract. Pre-define functions, change CSS, use. Any wallet integration out of the box, hosted on IPFS, mobile friendly. We've got almost two million deployed smart contracts, yet it's pretty difficult to interact with them.
The user of the widget receives synced state between the wallet and the front-end, address identification. Web-based at first could be easily expanded to other platforms (OBS widgets, Wordpress plugins, Zapier integrations, etc).
I think we'll transition to a more generative approach of UI creation as more and more network participants will be actively involved in the success of the project, ie a person that holds a token will want another person to buy that token.