there are many people who are alive today that remember the thylacine, they are just very old, however with Colossal's recent efforts, we will soon see the thylacine again
Just to set realistic expectations for thylacine revival, serious scientists have been talking about bringing back the thylacine since the announcement that Dolly the sheep was cloned in 1996. In almost 30 years it seems like very little actual progress has been made on that front, despite substantial effort by serious people.