I don't know that anyone says it is the "only" way. The real claim is that college offers a significant advantage which it would be foolish to turn down.
Hard to say how most High School students would be able to accurately gauge that college would be useless for them ahead of time, except if they already couldn't handle academics.
Of course not, because it is not implied that it is impossible to do without, only that it is an advantage and that it is prudent to take all the advantages you can afford.
Hard to say how most High School students would be able to accurately gauge that college would be useless for them ahead of time, except if they already couldn't handle academics.