Revenue is an obsolete concept at the Federal level. Currency issuers are not dependent on taxes to fund spending. Taxes have other roles, like controlling inflation.

All currency issuers can always pay any debt denominated in their native currency.

Whether higher education is producing a quality product at a fair price is a completely different discussion.

Whether the degrees being produced align with the workforce needs is yet another different discussion.

Whether jobs actually require the degrees that employers specify is yet another different discussion.