iOS to Android compatibility layer

So I am apart of the lost media scene, and something popped in my RSS feed.
Columbia Cydia, a old project for android to run iOS apps.
What I am interested in is would it be easier to develop an emulator to run apps rather then do what Wine is to Linux and run app store apps on android?
Just wanting to get peoples opinion on this, just interesting to know something like this was in the works.

https://systems.cs.columbia.edu/projects/cycada/

Interesting idea, I personally have no use for this as all the apps I want are on Android, although not all are on iOS. If anything, I would rather be able to run Android apps on iOS