Our procedure for removing support for Cordova versions is the following. First, we announce that we are deprecating the given Cordova set and a couple of releases after that we remove our support for it. With this in mind, I cannot give you a precise timeframe for when the Cordova 4.0.0 support will be removed, however, it is highly unlikely that we will stop supporting it in the next 6 months.
Nevertheless, I would recommend updating your app to target a more recent version of Cordova - 6.4.0 being the best candidate. This will help you avoid any future issues caused by the constant changes to the iOS and Android OSs.
I hope this helps. Please, let me know if I can provide you with additional information on this subject.
Telerik by Progress