There seems to be confusion here between tram tickets and Travelmaster tickets.I'm assuming with the new app that the travelmaster cards are also getting retired?
Seems stupid spending all that money on the cards just to then get rid of them
The new Travel South Yorkshire ticket app is to replace the Stagecoach app and website selling tram tickets and sells the same range of QR code tickets - tram only 1 day, 7 day and 28 day tickets plus one day Travelmaster tickets.
Weekly or longer Travelmaster tickets are exclusively smart card tickets. In the next update of the TSY app it should be able to do the same as the Travelmaster app and use your phone to load the Travelmaster season ticket to a smartcard.