Does DL still serve the destination? Have you looked for reasonable alternative flights? Why not just be proactive and call and suggest alternative options (or cancel the itin if there are none)? If the change just happened this Saturday, it may likely require some manual review to fix which would explain why you haven't got any notification yet. I looked at past schedule change emails and while most come on Sunday's (just got one last night), I noticed a few that were sent in the middle of the week.