That's true, which is why you sell
degree value as an insurance policy. Mention how few D1 players get drafted (~2%), the average length of an NFL career (~3 years), etc. Football doesn't last forever, and very very few players become independently wealth in the NFL. That's not a hard sell, imo.
And we hear this stuff from our recruits all the time: "ND is 40, not a 4, year decision"; "Football will end some day"; "An ND degree will set me up for life"; etc.
It's definitely a very different tact than taken by SEC schools, and I can't say it's more effective; selling sun, fun, skirts and fame to a teenager will always be easier than personal responsibility. But thankfully, there are usually adults involved the recruit's decision-making process as well, and that's where we make up a lot of ground. ND offers a genuinely superior product to most of its competitors, and parents with the best interests of their kid in mind usually see that.