The thing is, none of us will really know until he gets to the point where he starts to rehab and see how his body responds...some people respond really well, others have complications. Think about how long Lonzo Ball was out for a meniscus. OTOH Kobe did come back quicker, but his production suffered after his return...but it could also have been because he was 36 when had the injury and was losing his explosiveness due to age anyway. We will just have to wait and see. The positive is the surgery was done quickly and there were no complications from the procedure itself.
But Tatum's a good player, and a smart player, he will figure out how to adjust if he has to. His career is far from over.