How long will the US Postal Service be around?

Recently, the United States Postal Service has been running huge deficits in the billions because the rise of email has led to the decline of regular mail. They’ve been borrowing lots of money from the government in order to cover their debts but their line of credit is almost used up. With the new atmosphere of budget cutting, it is unlikely that they will be able to get any more credit. Do you think that the USPS will one day go completely bankrupt and cease to exist, or will it be bailed out because it is “too big to fail”?