I know, I know, we’re all still on iOS 10 (even us developers), but it’s very likely that Apple will drop support for 32-bit apps in the next release of iOS.
I’m happy to say that all my apps have been 64-bit ready since around 2014 so rest assured that all your Black Tablet apps will carry on working with iOS 11 (as far as I’m aware!).
If you have only a 32-bit device then all your apps will continue working but you may not be able to update some of them any more and it’s very likely that you will not be able to update to iOS 11.
Time will tell.