I very much like zcash and it’s value proposition. I’d love to see the day where every transaction is shielded by default.
The ECC has said they want to eventually depreciate transparent addresses but haven’t given any specific timeline.
I do know it’s not in the Blossom network upgrade scheduled for this October, and I would be very surprised if it were in the next one (2020) because it would require all existing services like exchanges/wallets/pools to support them. Not to mention you have to figure out how to force every holder to move thier funds to shielded addresses. I would not hold my breath for the next two years, but who knows after that.