Correct, I should have said "the platforms dropping 32-bit processor support".
The ability to run 32-bit applications means that preexisting libraries cannot incorporate Swift code yet.
The "application may slow down your phone" warnings that users are getting with 32-bit apps this year is a pretty strong indicator that Apple is going to remove support for running 32-bit apps completely for iOS 11 or 12. They previously had a deadline for apps to have 64-bit version submitted, but backed off the ultimatum for now.