Here’s probably a crazy idea. 
It would be amazing to see deeper integration of Principle into Sketch, maybe even as a third tab in the sidebar called Animate. Principle is still one of the best ways to quickly prototype interactions and its timeline is super simple and powerful. Principle seems a bit dormant for a while, I think merging with Sketch would make a lot of sense for both products.
You should talk to Daniel Hooper to hear his thoughts, maybe something interesting can come out of it. 