DaRon
I'm not so much worried as i am sad. Syncthing is perfect for my needs for a local sync and backup solution, i liked and supported the project and haven't found something which fits equally well for me.
If the Android app is no longer developed, problems or security issues may occur at some point.
I'm glad that someone forked Syncthing but that doesn't mean that the developer is automaticlly equally trustworthy nor that the project will continue just as well as it did before.
But you're right in a way - that moment hasn't come yet and hopefully won't come...