Say so to the people who is using RxJava or similar, whether they need to rewrite everything or not. In every program you need to take architectural decisions t

Say so to the people who is using RxJava or similar, whether they need to rewrite everything or not. In every program you need to take architectural decisions that affect how everything is build and a change on them could mean to rewrite everything. It can be a library or the programming language. JetBrains was supporting kotlin for Android, the same people that build IntelliJ idea (the base of Android Studio). But who is supporting RxJava? Imagine that the react community wants to make a move that will harm Android devs, so they change all the Rx*, including RxJava. Using kotlin wasn't a risk. Google said it will make it first class citizen, but do you really trust Google in the long term? They close products very quickly. I feel safer knowing that JetBrains is behind kotlin and not Google.