In a recent interview with comicbook.com the Russo brothers confirmed what many of us suspected, Endgame will be the last cameo for Stan Lee. They were however very careful to say last committed to film. This leads me to believe they will continue to carry on the tradition in other ways, maybe with pictures or something of the sort. Either way, I think the legacy of Stan Lee and his cameos will continue. Best wishes and may the gaming gods bring you glory.