Earlier quoted context omitted.
I understand the bulk mailers make up a good portion of their income, and effectively subsidize regular mail. However, I don't think it's an acceptable tradeoff. You can makeup for the difference by probably dropping a single day of delivery - my guess is postage wouldn't even have to raise if you dropped to either 4 or 5 days a week.
They are going with what they know makes them money. They have already cut Saturdays, and I would expect them to cut another day too.
They haven't cut saturdays in my area, so it's probably just a regional or maybe rural thing?