I assume this was a domestic ticket? I have seen a situation where Delta extended a ticket for 30 day beyond the expiration date (travel had to be completed). I am about 99% certain, you will be lucky if you get that.
Million miler will have zero affect. If it is an international ticket, then you could restart the clock by having it reticketed prior to the expiration date and the clock will start over again. Of course, you will then pay two
change fees, so it may not be worth it.