I bought a backup Airport Express when Apple announced their discontinuation, so I'm OK as far as parts go, and I don't see how Apple could possibly not support Airport Utility for at least as long as they're going to support the hardware it manages...2023, as you said.
So I guess we're OK for at least three more years.
The new Great Equalizer is the SEND button.
In Memory of Harv: Those who can make you believe absurdities can make you commit atrocities. ~Voltaire
