Not sure whether their figure was for all assets or just retirement specific savings. I probably have a net worth of that amount but not that amount specificially set aside for retirement. (In other words, the equity in my house, other savings, retirement savings, vehicle, etc. would exceed my debt by that amount.) Plus, I hope to retire when my daughter starts college, so I need to be saving for both items. You do have to be pretty agressive in your 401k savings...do more around the max than around the minimum. At the very least, contribute the amount that your employer will match.
All that said...I live in a small house with a small mortgage because that's what I an afford while being able to save for other things. Until this spring, I drove a 2003 basic model sedan because that's what I could afford without incurring debt. (I paid cash for he replacement.) My household has one television, no gaming system, no personal cell phone, no Tivo/DVR, one pc, and I just invested in an iPad. I do not have all those nice things that some of my friends have, but they may be in debt up to their eyeballs. What I do have is a house that I could payoff if i lost my job and an emergency fund that allows me to pay for the invevitable appliance repair, unplanned illness, etc. I don't consider that to be "swallowing my pride"; I consider that to be appropriate prioritization. At the same time, my dad died suddenly at age 68, so I also believe in budgeting money for fun and entertainment vs. scrimping to put every dime into future savings (not going into debt for those items, but working it into the budget along with savings). If you are spending too much on material items without saving for the future, start saving more.