It's not - I had virtually no college savings when I went to college, my parents borrowed almost the full amount (mostly in their names, so that my sister and I would be mostly debt-free when we graduated). Five years after graduation, it's paid off in full.
$50K/year is, however, low enough that you can get some really generous financial aid if you manage to get into an elite college. Nowadays it'll give you a full ride at Stanford/MIT/Amherst; in my time it was more like a 2/3-ride. Or a full-ride merit scholarship at a state school, if you could otherwise get into an elite college.
Also, weren't we talking about making $100K/year and spending like you have $50K/year? If you do that, in 4 years you've got your kid's college education fund.