TOS, one of the reasons losses are projected to grow is because the "loan" received by the Post Office - those funds for the pension they were "allowed" to keep - is to be repaid, thus exacerbating the problem.
While first class revenues are declining, people underestimate the size of the population who either choose not to go digital - mainly older or the less educated- or CAN'T go digital, such as in places with limited Internet access, or poor areas. In the city, I have friends who would love to have bank accounts with direct deposit, but due to problems are not allowed to have one (eg. they had an account closed due to being overdrawn; other banks and credit unions are made aware of this, and now they cannot open an account anywhere). Recently companies have begun targeting these people with products like Russell Simmons' 'Rush Card', or 'Open, from American Express', but these products are still relatively new and have not captured more of the market. There's also concerns with fees on these cards; granted, there are no fees, but that perception still exists, and in a couple cases has even been negatively reinforced. There was a case here recently where a McDonald's forced its employees to use a card issued by the franchisee if they didn't already have direct deposit. However, they were charging them 'processing fees' for using the cards they were forcing then to use! An employee sued, and they had to give them the option to receive checks, which many did; some of those inevitably may get mailed. And then there are those who do not receive regular pay, particularly those who are paid by commission, like consultants and artists. For many of them direct deposit is not an option, nor is going to an office to pick up a check.
This is just one example of why the Post Office isn't going anywhere; the demand will not go anywhere. As for the funding issue, in addition to the ridiculousness concerning the pensions, there's also the problem regarding postage. It costs 4x as much to send a letter from one side of Germany to the other as it would to send a letter from Florida to Louisiana, and yet that is about how wide Germany is. 44 cents to send a letter from NY to LA is grossly cheap, and yet it takes an act of Congress to do the simple thing and raise the rates to a more appropriate level for what's necessary to actually get a letter from one place to another. Will raising the rates drive away even more customers? Probably, but again, there is a sizable part of the population - and business world - that can't get their letters and even packages no other way, and aren't going anywhere, as well as others who could perhaps choose to go online, and be cheaper, but choose not to. Shoot, personally I have to mail my rent check every month; I once suggested the realty company perhaps switch to PayPal, and they told it would make things 'too complicated'!
So no, I do get why the Post Office is losing money, thank you very much, and it's not just because 'nobody uses them anymore'.