If nothing else they kinda have the opportunity for Tom to return as the alternate Battle of New York Loki. I am curious what he planned to do with the Tesseract...
Part of me wishes that they had Steve leave a message in the main timeline and reveal that he had gone to an alternative timeline where he could rescue Bucky from HYDRA and defeat them before settling down with Peggy. But this way it does at least mean he can have a possible cameo in the future.