Enough is enough.
If the Postal Service cuts back to 5-day delivery, it's time to go postal on the Postal Service.
Kill the USPS, turn it back into the Post Office Department, and stop worrying about it losing money. It was never supposed to make money in the first place. Oh, and stop giving every damn mailbox spammer out there super-dooper cut rates to jam my mailbox full of crap while you're at it.
But, bottom line, stop trying to balance the budget on services like the USPS. Get rid of worthless crap like the EPA and the Department of Education first, and then come back and we'll talk.